FAQ Friday: Do I need to trim bump stops?

Some of our lowering springs include instructions that tells you to trim the bump stops, have you ever asked yourself "Why" or "Do I really need to?" If so, this video is for you!
In this episode, Michael from our Engineering team explains why we need to trim bump stops when the instructions asks you to do so.
To find the instructions for your vehicle, visit:
eibach.com/instructions

[@garyhowells2399]

I have this problem with a Bilstein B12 pro kit on a BMW Z4M. You would think as a kit the shock bump stop would be trimmed to work with the supplied Eibach spring which lowers 20mm at the front. Bottoms out really easily and makes me wince.

[@rasheedsingh9730]

Thank you so much for this

[@george5stars]

I ordered a eibach pro kit for my Volkswagen Arteon 2022. Should I trim my bum stops? I didn't have any guidance or instructions.

[@JakeTaco83]

Mine came with new front stops (mk7 VW Sportwagen) but Im not sure if I should trim the rears. Does it matter if the shocks are made for lowering springs, because the ones I got are?

[@atam1056]

Do I need to trim the bump stop for a 2022 MX-5 on OEM Bilstein Suspension if I want to lower it by like 20mm?

[@MaxDiachenko]

Where can I find bump stops trimming instructions for tesla model 3? There is no bumpstops come with springs in the box

[@diegojara4454]

Do you need to trim the bump stop for the pro kit on an e46 M3?

[@user-gp1zj2er3e]

Got b12 pro kit for audi s5 back end sitting higher than front by loads gap in rear arches looks weird do I need to trim bump Stops

[@rickytorres5911]

Where can I get caps to replace the bump stop after removing it

[@kevinpowell3643]

Hi there ive just bought the pro kit from deementweeks but it's came with no instructions do i cut back and front bump stops it's a mini cooper s f56 thanks

[@bulletkip]

my bump stops are squeaking. would it be ok to apply some silicone lubricant to the inside part of the bumpstop that comes into contact with the strut to remedy the noise?

[@samuellim7601]

For cx3 2018 if I change to sport lowering spring how much do I have to trim my stock absorber bushes or what oem bushes do I have to get for the size

[@klibra105]

a bought a Bilstein B12 kit that came with eibach springs for my 2012 bmw x3, and the rear shocks didn't come with any bumpstops (or dustcover). Do I need bumpstops, and if so, which ones?

[@tuttoo]

Do i trim front and rear? or just rear?

[@justwatchingffs371]

And now you have nowhere to attach the shock boot to cause you cut that notched part off.

[@mrglock8895]

I bought the sport line kit for my 22 mustang gt. I used the factory bump stops and not the ones that came in the kit. Any issues I might run into?

[@EibachUSA]

If you have any ride discomforts that may be the case.

[@AlmightyRandy]

QUESTION: Would not trimming the rear bump stop cause a clunking noise? im experiencing clunking noise when hitting bumps in the road and on the highway when going over small dips. I’ve checked every nut and bolt but I can’t seems to find what’s the problem. (Eibach Pro Kit Lowering Springs) I have a 2021 Dodge Charger Scat Pack.

[@EibachUSA]

Hello, please reach out to our tech support team: eibach.com/us/p-187-technical-support.html

[@samrmills]

Hi. What was the outcome on this? Were you able to determine if the clunk noise was in the front or rear? Thx!

[@volkspc555]

​@@samrmillspretty sure it will fix the clunking issue, depending on the type of springs installed

[@kjpphotography4764]

I went just purchased KYB R4273, KYB SR4274, KYB SR4068, KYB SR4069 for my 2007 Toyota Corolla S. since those are OEM shocks and I want to install some Tein Lowering Springs. Do you sell pre-cut bump stops for that set-up? Can I the stock coil dust covers that came with the shocks and struts?

[@EibachUSA]

Hello, that question is best answered by Tein, we don't know what they recommend.

[@kjpphotography4764]

@@EibachUSA I know what they want cut off on the front and rears, I was just wondering if you folks made already cut bump-stops. I am a little surprised that you guys don't corner that market, and produce ready cut ones for folks that buy your stuff.

[@garyy3758]

Thanks for sharing, just want to know do i trim one inch for every one inch low ? Iv dropped my car about 2 inches all around does that mean i need ti trim 2 inches off bump stops? Im bottoming out on the front at higher speed.

[@EibachUSA]

Our trim instructions are vehicle specific, so trim to the instructions, not anymore.

[@michaelvanna8982]

I bought pro lowering springs for my mini r56 which lowers 1.2 inches...do you recommend shaving bump stops front & rear around 1 inch? Thanks

[@EibachUSA]

It should say in the instructions

[@Birdofski]

More shock travel with trimmed bump stops is obvious. However; what effect does it have on the stock shock longevity? Removing 1" from the bump stop, would cause the shock to compress further than with untrimmed bump stops, putting more stress/pressure on the shock.

[@EibachUSA]

Hello, trimming the bump stop won’t have an effect on shock longevity. The bump stop acts like a progressive rate, once you hit it you add rate and gives you bottoming resistance so you the transition isn’t so harsh when you reach the end of your travel.

[@b_jovi4646]

Could this actually be the problem on my Porsche 996 C2??? I’m literally about to swap to HR’s to try and solve the high ride height vs the drop in the rears… I am literally driving a boat. In the instructions it states no modifications required but on many forums, folks are stating the same issue… please advise as it will keep me a customer if this solves the issue… thanks!

[@falconlips5474]

I have the same, my rear suspension is almost inactive and totally feels like a boat now. Didn't used to be that way. I thought maybe I'd blown the rear shocks by overloading but when I examined them they looked ok. About to go back to OEM sport springs on the rear I think!

[@limitedweeklyremixes4383]

Will trimming my bump stops make it sound like I'm not bottoming out? Or do I just have to much play with the shock itself? 🤔

[@celinej8977]

Don’t trim them! I trimmed mine and it makes a loud clunking sound when just on a flat road So now my cars been down for a week since I’m waiting on new ones to come in just extra money wasted

[@Travis.Rivera]

@@celinej8977was this resolved? I seen another comment someone said he had clunking from NOT trimming the rear

[@celinej8977]

@@Travis.Rivera no I ended up replacing the bump stop and just went on from there

[@Travis.Rivera]

@@celinej8977 how low did you go? And how much did u trim off the bump stops. Thats weird

[@celinej8977]

@@Travis.Rivera only a day didn’t wanna damage anything so left the car in the garage till the new bump stop came in but I cut how much they did in the video

[@jayionfields3016]

With 2 inch lowering springs , do I trim off 2 inches for the bump stop ?

[@reviewsandstuff4447]

That's what he said

[@mrhalim6703]

my standard rim 16ich, should I trim my bump stopper if i change 18inci rim?

[@EibachUSA]

You only trim it if the manual on the product says so, otherwise no.

[@9thK24]

I’m buying a used set of springs 4088.140 for my Civic Si… they are missing the Bump stops, can I buy them direct and whats the part number? Thanks

[@EibachUSA]

If you're in the US, give us a call at 800-507-2338

[@RrRr-th1kf]

Eibach USA can i install for my camery 2005 one and half of jounce bumper to increase the height and save my shock from damage? Or just one is enough؟

[@neil2839]

is that the oe bmw strut ?

[@EibachUSA]

We used a VW strut for this example.

[@FPVREVIEWS]

Why lower the car then cut the stop..???? Just moving the problem further down the line and screwing up the car. Good luck selling it to anyone not dealing crack