Shimano ROTORS XT /XTR MT800 / MT900 Center Lock Brake Disc Rotor vs XTR RT99

#Shimano rotors, #XT and XTR #CenterLock launched with the 12 speed drivetrains, all FREEZA type. MT800 for XT, MT900 for XTR compared to the generation XTR/ Saint, the RT99 that I've used for a couple of years.
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Shimano XT MT800 Center Lock Rotor - bit.ly/2Z9wrBy
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SHIMANO SLX SM-RT66 6-BOLT Rotors - bit.ly/321U0Op
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Shimano XTR RT-MT900 Center Lock Disc Brake Rotor 180mm - bit.ly/3jYKQJx
Shimano XT RT-MT800 Center Lock Disc Brake Rotor 180mm - bit.ly/30fHtG9
Shimano SLX SM-RT70-S Center Lock Disc Brake Rotor - bit.ly/33Sr90x
Shimano SM-HB20 Lock Ring for 12/15/20mm Axle Hubs - bit.ly/3ajj3PI
Shimano XT RT86S 160mm 6-Bolt Ice Tech Disc Brake Rotor - bit.ly/2DWokka
Park Tool FR-5.2 Cassette Tool - bit.ly/2HRxRqr
Park BBT-9 BB Tool Shimano Hollowtech II - bit.ly/2uNKcqv
Park BBT-69.2 Bottom Bracket Tool, 16 notches, 44mm OD - bit.ly/2v4QIZ4
Shimano brakes, discs and pads - bit.ly/3hQR6RR
Shimano BH90-SB Brake Hose Olive and Insert - bit.ly/2wKfu25
Shimano BH90-SB 2000mm Disc Brake Hose Kit - bit.ly/2Gwwpde
Shimano Brake Fluid - bit.ly/2GIfsPo
Shimano Oil Funnel Tool - bit.ly/2Euno0W
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My channel is not sponsored. All opinions are my own, 100% honest. Some of the links in this description are affiliate links. I'll earn a small commission if you make a purchase and it's no additional cost to you, I appreciate your support!

[@SuperK75th]

I’m running the older XTR version 203mm / 180mm with the SLX 4 piston breaks on a Scott Scale 960. I live in Medellin, CO and really appreciate your technical content. Huge difference from factory mainly because I’m a 120k rider.

[@lukaslewandowski5756]

Your Chanel is great. Very informative and no BS 🙂 Keep going my friend 💪

[@javi2005]

I'm happy every time you upload videos I'm from Ecuador.

[@darrensmith9182]

Love your reviews information rich and no bullshit ,i like how you show everything about the product even the box .welldone cheers

[@MyZippy13]

Best straight to the point information that i needed. Thank you

[@MTBActionCam1]

Thank you for removing the orange sticker. I see so many Shimano rotors on bikes that still have the orange sticker.

[@brunofuke8640]

Kkk,a minha tem,vo lá tirar,valeu ótimo vídeo

[@josemanuellopez2524]

It's to more power 😂

[@MrChando1975]

Exactly the video I was looking for. Thank you.

[@WOLFTICKVIDEOS]

That is a sweet looking rotor, that's for sure. I'm actually thinking of downgrading my brakes and rotors, I just have too much brakes with the mt-420's. Thanks for the video. Very informative as always.

[@Hawlkeye-e9p]

Man i like the quick lock stuff.

[@pacosenderos]

Excelente video, como siempre con mucha informacion y muy util. Tengo los discos MT800 y muy contento con su rendimiento.

[@TonchoTonev]

Great video as allways.

[@alexmalone1642]

I like your videos because u explain very good & almost all your videos have translate in my language Romanian 👍I apreciate that 😎

[@DoubleYouRandyBe]

2 years of using and your disc is still good? Not bad :). I changed my xt disc after 4 months of using. 😃.

[@sebastianriedel8627]

I use them (mt800) on my road and gravel bike and they do warp quite a bit. Front more than rear, I had to bend it a couple of times. Also they shift to one side when the get hot, which causes brake rub. But they do stay cooler than non-icetech rotors.

[@william_2610]

I might go for freeza ice tech ones next time. Don't think its worth upgrading unless your old rotors are screwed, but the extra cooling can't hurt. I do always use finned pads though.

[@razenkCL]

thank for this review!

[@tamasvarga67]

Awesome rotors I have them on my gravel bike. I like and prefer the CL interface but I wish they made them with 6 bolt too as my two MTBs are running those. DT Swiss has CL versions of their 370/350/240 hubs so you are not stuck with Shimano if you don’t like it.

[@Lestat1795]

Love my 203mm XT Freeza

[@Aaron-nh1ml]

Best channel!!

[@robertcraig4649]

Excellent. I’m replacing my old dura ace on rotors my gravel bike as they were distorting under heavy braking causing them to squeal after releasing the levers.

[@LoveMTB]

Just be aware that MT800 could be similar they’re very thin

[@SuperJerot]

My old xt/xtr without the fins are worn out. Do you recommend sticking with them or upgrading to rt99 or mt series? As I understand a bit lighter perhaps, old ones are a lot cheaper but is the performance better or the same? Riding a light bike and I myself am on a lighter side and I have metalic pads. Thanks for awesome timeless content and all the advice!

[@jamble7k]

have you had any problems with centrelock mounts developing slop over time? have read some had trouble with xtr centrelock hubs in this respect

[@martinb.8620]

Muchas gracias por el vídeo.

[@vincentblanc8432]

Best rotors in the game. Period.

[@jackjosan7238]

Do these rotors come with both sizes of lock rings? im looking to get these and I need the larger one as I have a 15mm thru axle front and qr rear

[@benmillns8976]

I've just seen that Shimano have released the MT-905 rotor, which is the first Freeza rotor for 6 bolt. Unfortunately not available in 160mm, so I've just bought a 180mm for the front of my hardtail and I'll stick with the good old RT-86 in the rear.

[@TheProjectX3]

This video should be a homescreen for some. I still bought the old XT one because of the price drop for them, great deal. I think the new XT is a bit heavier?

[@fra93ilgrande]

The black paint on the XTR version is for even better cooling 👍🏻 heat dissipation paint

[@LoveMTB]

Yeah apparently 10!degrees worth…

[@RajivHD]

Hii, nice revieww! this disc will work with caliper without ice tec? mt 200 for instance?

[@Ropetable]

They look so god dammn good too. The black paint on the xtr is supposedly a coating that dissipates heat even faster.

[@wazzzaaapdude8748]

Painting them black will absorb more heat from the sun, so basically if you ride in a summer in the daylight, I can imagine they will be worse for heat dissipating then a lighter/metallic color.

[@Ropetable]

@@wazzzaaapdude8748 I highly doubt it. would make sense, but its not just paint. i have both the xt and xtr models, and i ride in the blazing sun, but they still perform noticeably better. probably not much but its definitely noticeable.

[@user-nt8ug2tm5p]

i love your channel and videos. I have a small question. i have a hollowtech tool but i can't use it for my BB-mt800 bottom bracket. I can use it with included with BB special shimano adapter. I need new (better) tool. If i buy "Park BBT-69.2 Bottom Bracket Tool, 44mm", should i use the same special shimano adapter to install/unistall my BB? or is it the size of BB-mt800?

[@dsag3366]

I will be replacing my rotors with mt800s. My stock rotors are 180mm in the front and a 160mm in the rear. Would you recommend keeping it the same or going with a 180mm in the rear?

[@samuraioodon]

So only difference in lockring is the 2 grams and tool used? I'm trying to decide if I should get interval so I don't have to buy that 16 notch torque wrench...

[@enekogonzalez869]

can i use this rotor in the rear wheel of my ebike which has the magnet in the rotor?

[@MrChando1975]

Question if you buy this kit you will get the rear and front disk?

[@OneCosmic749]

I have the MT900 in the back on my ebike/bafang M500 together with the BR-MT520 caliper and stock resin pads but i sadly didn't have the time to properly heat them up yet :) Need some proper longer downhill road. I have once overheated the stock back MT200 brake with the stock shitty 160mm rotor when it really started to fade and was very near smoking :D

[@samuelpersico]

Thank you so much I needed this comment!! I was looking for someone using the same caliper as me to see if the rotor disk fitted for the br mt501 calipers, im on the scott strike eride 910 from 2021, and it uses 203mm disks, I also thought about upgrading here in a bit to the Shimano Saint br m820 using 203mm disks and popping on a 160 travel fox fork instead of 140 fox rythm that comes stock with the bike, Shreeeeed on!!!!!!

[@syntrax-og]

why aren't these available in 6-bolt options?

[@mazditzo]

old skool 6 bolt xt ice tech ftw, affordable and great performance for majority of us ! HonesyI want those freeza but centerlock... sad

[@synsynsy]

the RT-99's are the most BADASS rotors ever made by shimano. They look so damn good. They are worth buying just because the look so aggressive. Prove me wrong, I dare you...

[@Aaron-nh1ml]

nice

[@paweldziubka]

Can you use Then with sram brakes?

[@ferdhyfeyz29]

Can i use it this rotor on my trp slate 4 brakeset?

[@artgreg2296]

Is that make sense on unrestricted electric bike?

[@p199a]

can u use this with SRAM breaks?

[@user-tb9wk2ki3g]

Yo what's a good caliper for measuring pads and thickness of the disc? And does onyx hubs compatible with that rotors?

[@axfx8952]

Caliper is not the ideal tool for the task. It does the job but the measuring area (as shown on the video) is too large and..... Hopefully you get the point. To be more precise you need a micrometer and several measurements.

[@harrygaze7760]

Compatible to all centerlock hub sir?

[@ronnienewsome800]

Were is the built in magent?

[@brustbenjamin5137]

Hello, I have slx m 7120s and I would like to put the disc just forward. Do you have to have plates with fins? thank you

[@brustbenjamin5137]

slx mt 7120 the number of pads with elette esque is no4c metal? . Are pads with ellettes really effective? thank you very much

[@simonbragg-coulthard9883]

Great video! I have bought a pair of Freeza MT 800 rotors . front rotor fits perfectly , back rotor has a play between the hub ( DT swiss 350) and rotor of 1.0 -1.5 mm . it feels like the internal lock ring does not want to go in any further even with 40nm +. I switched the internal rear lock ring with the bigger front external lock ring and it fits perfect . could it be that the smaller rear lock ring is deeper than the front ring and preventing it from tightening properly ? or do you have another theory ? thanks for the feedback stay safe and ride 🤙🚲

[@simonbragg-coulthard9883]

@@LoveMTB hi thanks for reaching out , threads go all the way , but I managed to solve the issue with a bit more grease and tightening the ring more . I guess it needed a little encouragement .no damage has occurred to hub or ring . Anyhoo thanx again and I look forward to more videos 🚵🤙

[@catg9196]

I wonder why the XTR rotors have black aluminum fins? Performance advantage over XT?

[@christopheledan7793]

black matt is better heat exchanger

[@myroaming6423]

Thank you for this review which is new between rt900 vs sm-rt99 and which is best for xc please and I am beginner

[@myroaming6423]

@@LoveMTB Thank you very much and I will find to setup :)

[@95thRiflesOCI]

and I thought my 80G rotors are heavy. These are much better then those SRAM cooling two piece ones tho.

[@Samazing01]

I've always wondered why they haven't made one for ISO 6 bolt.

[@samuel-JF1981]

Probably to give us a opportunity to buy a Shimano wheelset... 😅😇

[@docfmf8404]

Can I use this on a roadbike

[@Vylkeer]

I’m getting interested in upgrading my pre-existing bike gear and would like to know if it’s worth it, from someone who’s expert about this. I currently have a pair of 160mm SM-RT53s which have served me very well for years. These are the stock rotors my bike came with and not only did I buy it 9 years ago, I think these discs, even if they’re very good, came from a mid-low range of Shimano offerings back then. I found them online and they’re still sold for like $20 which I assume is what they were worth back in the day as well. How would the RT-MT900s compare to them? Would it be a worthy upgrade? For one they’ll most likely be lighter and should be way better at managing high temperatures and also provide a better bite. In fact, I also plan to upgrade the calipers and get the ones from the XTR lineup which are ideal if used in conjunction with the RT-MT900s. Will I notice a slight improvement by just putting these rotors on, before even changing the calipers? Should I get them bigger like 180mm to have an even bigger improvement or 160mm with these new rotors and calipers will already be a worthy upgrade? I know, I asked many questions but I’m really trying to figure out if I should do this or not.

[@Vylkeer]

@@LoveMTB So I shouldn’t upgrade the rotors from the old SM-RT53s to the new RT-MT900s? I think even by keeping them in the same diameter they should provide better braking, especially if paired with new calipers.

[@Vylkeer]

@@LoveMTB I’m actually going to improve all the other compartments of the bike like transmission, bottom bracket, pedals etc … including the braking as I said above. So everything else won’t be the same. The only things that remain the same are the chassis, fork and handlebar.

[@Vylkeer]

@@LoveMTB Thanks for the advice and your time! Will get them ASAP.

[@mareklazarski3719]

My new bike has 6 bolts rotors. I want to convert to a shimano center lock. Is there an adapter that allows me to do this?

[@mareklazarski3719]

@@LoveMTB I will have to stay with 6 bolt. Thank you for the professional advice. All the Best !

[@onilovni1234]

I think the RT99 are stiffer by design since the aluminium spider has 5 points on contact instead of 4 on the newer model. At least I noticed I get a little less brake rub on the older ones.

[@onilovni1234]

@@LoveMTB 180 front and 160 back

[@okosakaroklenni]

Do you know if it is somehow possible to use the MT905 with CL adapter? My front hub is CL and the rear is 6B, and it would be nice to use same looking rotors, the 905 and the 900 aluminium body just looks too different :) Thanks

[@LoveMTB]

I don't see why not, it is just a 6b rotor, standard

[@okosakaroklenni]

@@LoveMTB shimano and dt Swiss adapter manual says they are not compatible with rt86 and other aluminium bodied rotors. :/

[@LoveMTB]

@@okosakaroklenni I did use it though 😊

[@okosakaroklenni]

@@LoveMTB thanks, now im emcouraged to do so too :)

[@LoveMTB]

@@okosakaroklenni let us know how it works for you!

[@peterbaskind9872]

What is the difference between Shimano ROAD discs and MTB discs? Are they interchangeable?

[@peterbaskind9872]

LoveMTB Thanks. I have often wondered. My road bike has a 6-bolt hub. The best option for a disc I could find was a Shimano XT RT-86. It works great, but I was wondering if I had broken some unspoken rule.

[@shaodesu4760]

Hi! Will these mt800/mt900 rotors fit a slx m7100 hubs?

[@shaodesu4760]

@@LoveMTB thank you so much! Was confused by the lock ring, didnt know the had different diameters, anyways, thanks for the tip!

[@miguelitoskwento316]

is it possible, if i use shimano FH mt500 hub to that rotor, how about the compatibility? im planning to buy, shimano hub and ice tech rotor..^_^.. thx

[@miguelitoskwento316]

@@LoveMTB thank you so much..^_^..

[@pedropramireza]

What do you think about the SLX rotors?

[@pedropramireza]

@@LoveMTB thanks, now I just need to find them somewhere in Chile hahaha

[@user-wn6vc8iq6b]

Can it be used with BR-U5000 brakes?

[@user-wn6vc8iq6b]

@@LoveMTB Not at 160mm. I currently have a Shimano ultegra sm-rt 800 brake disc 160mm.

[@user-qr6zn7gr5k]

Support MT800 in road bikes? I have Merida scultura 400.

[@user-qr6zn7gr5k]

@@LoveMTB Thank you!

[@carloswithac]

Freeza! Rotors shaped by Krillin!

[@vialactea5549]

@@LoveMTB It's from Dragon Ball Z lol

[@mortenb9126]

can I use my slx brake caliper for RT-MT900 ??

[@mortenb9126]

right now i the caliper i have is a Shimano SLX M7100

[@thephoenixcycle8854]

The Freeza rotors look weird. What I don't understand is what the differences are to merit the extra money for xtr vs xt.

[@TheRickysee]

Is there an Mt800 S? And what is it?

[@LoveMTB]

S in the description?

[@kofalin]

I’m gonna get them, the cheap ones on my bike bend really easy ☹️☹️

[@domestique3954]

They also bend - take a look at the channel of Peak Torque - he tested them and found out about the weakness of the discs-Dura ace and XTR--basically you will need to change them on a yearly basis-same with the pads! At least if you ride mountains-descents tend to overheat the disc and that will also overheat the bearings....

[@zumezoom9593]

ever seen anyone installing all these parts on a gravel bike? or would that be a waste of time, money and energy?

[@zumezoom9593]

@@LoveMTB honest opinions preferred, thanks!

[@garethdavies7564]

why dont they do 6 bolt in them?

[@sebastianjost]

I like the look of freeza rotors but only have 6-bolt hubs. So I went looking; Check out the rotors from uberbike linked below. They offer finned rotors in different colors and with 6-bolt instead of centerlock. I don't have any experience with the company but if I ever need new rotors for my road bike, I will probably order those. www.uberbikecomponents.com/view-product/Uberbike-Radiator-Floating-Disc-Brake-Rotor-with-Heat-Dissipation-Alloy-Fins-BlackBlack Another thing to keep in mind when buying new hubs/wheels or a new bike: There are adapters to mount 6-bolt discs on centerlock hubs but not the other way around. DT Swiss hubs and wheels usually come with that adapter.

[@sebastianjost]

@@LoveMTB I think the main reason for buying them is that they look very nice. You really have to ride long descents to actually need them.

[@ThePakovia]

I have these on my ebike 203mm super powerfull impossible to overheat

[@JogBird]

mywheels inly 6 bolt

[@Pillokun]

MTB disc rotors are still too thin, I over cook my all the time and I run an 203 on my xc. I am actually thinking of moving back to my old xt v-brake with crossmax ceramic combo as they do indeed brake better an have way better modulation/feel.

[@colintraveller]

That's because people are simply willing to accept it . Instead of actually complaining by making there feelings known through there wallet . And the channels on here never call out companies .. because they would rather keep the freebies coming in than actually complain .. they are fucking dishonest 2 faced liars they recommend bikes with Shite brakes , fault gearing you name . there is NO TRANPARENCY NEVER MIND HONESTY amongst the channels ..

[@jimig399]

I used to feel that way. I was hooked on my old tektro mechanical disc brakes with the thick rotors. I don't think I ever changed a rotor but I did burn up some pads. The modulation on them was flawless. I could do 20-30 feet of stoppies with my rear wheel super high and crossed up. I really hadn't given the new tech a real chance tho. Why change what has worked for so long right. Then I got a new Vitus Sommet with XT brakes. I didn't like them at first. But they are growing on me. They stop hard and modulation is better for sure then the old mechanical brakes but It seems to be a bit inconsistent given temperature, weather conditions and environment like dirt, sand and gravel. The mechanical were more consistent and bullet proof. So much room in between the pads that debris would just fall out. These new brakes are packed in so tight that debris can become an issue. Im old school on 2 wheels. I love most of the new tech but I could go back to mech brakes and 3x8 drives and ride happy forever. These new 1x12 are ok. I'd much rather have my slingshot 3x tho. Im sick of adjusting this 12spd derailleur every day before I ride because I need to be able to run thru them all. The old 3x8 id only use 3-4-5-6 in back with most of my shifting being in the front to get what I like to call the sling shot when you ramp up to the larger rings in front. Miss it 😢. The new brakes are better but the old ways were comfortable. Join the future... everyone is doing it. 😉 Just kidding. Ride your way.. just ride hard. 🤟✌️

[@walrusinanus]

I find the new rotors fucking ugly because of the cooling fin, and was horrified to learn RT81 was not being made anymore, so I scraped the crumbs left in local stores for obscene prices. Hopefully they will last me a few years.

[@High_Octane]

you're the minority for sure.

[@mortengaul7470]

From a noob to others. Yes, you can use your old centerlock "inner" from your old rotor, if you don't have the tool for the "outer". **Noob language.

[@user-wf5sj6qh6s]

там пылинка на раму ещё попала забыл тряпочкой вытереть

[@claudiuoroian3911]

they are crap. if you are roadie that don't use them too much I guess they are ok but if you a MTBer that rely on them heavily and you have metal pads they do get deformed pretty fast. And I mean FAST. I had to straighten the disk after each heavy ride. Never again shimano and clearly not icetech. They are not meant for the heavy rider. My mechanic told me to avoid them as he confirmed my findings as many have this problem. You just can't have light weight disks and good reliability in the same package. period.

[@irvsstella]

That rotor's now covered in greasy paw prints and pretty much scrap now. Steam bath it, then douse with disc cleaner, you might be able to grind to a gradual pause, eventually...

[@Kennethwolfgang]

Dislike for cleaning the bike with a pressure washer and destroying the front bearings

[@tamasvarga67]

Kenneth Honig Are you trying to be smart or just an a**?

[@colintraveller]

Why do you never see ceramic disc brakes .... on a bike when they are more acceptable for use on Motorbikes and Cars ... And the Brake Rims are less chance of snapping unlike that of those on bikes which are too THIN .. You fail to make such points known .. because you are happy to accept what your given .. You aren't asking those such questions ..WHY ??? And you never once make the point .. is the purchase really relevant Is it really worth spending more money ??? When the current one still does the same bloody job .. Surely it would make sense to include those when buying ..brakes for your bike .. You never question anything ..

[@jaspreetsidhu5708]

Bikes don't generally gain as much speed, much smaller mass, ceramics need to heat up before they really show their performance. I do think it would be nice but it would be overkill for roadies.

[@SteveSUX2BU]

Don't know why you have so much trouble saying "saint". It's not pronounced "siant".