What Size Bike Should I Get? • The Ask Jack Show • Episode 10

Finding the right size bike is critical to your efficiency, comfort, and safety. The problem is, the correct size for you is not always readily apparent, which creates doubt surrounding your buying decisions. Especially, when you're in-between the manufacture's recommended sizing.
There's no single "golden rule" for bike sizing, but there are some factors involved that can guide your decision if you know about them.
In this episode of the Ask Jack Show, Jack answers the question, "what size bike should I get", by giving you the factors involved, and their effects on rolling momentum, steering response, and bio mechanics.
We appreciate @aivarb and @stefanomancini for their great questions. If you have a question you'd like answered, don't hesitate to post it in the comments section. We'll do our best to help you.
Thanks for watching, Jack
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[@ashleyhouse9690]

The may be no "golden rule" for selecting the right bike size but in my experience there is a pretty good rule of thumb. I have been riding for decades and have been invariably recommended the wrong size bike by manufacturers' sizing charts. And it's not as if I am a) weirdly proportioned or b) in between sizes. They just always recommend too big a bike for me. My rule of thumb is this: You want a bike that gives you a stem length of between 90mm and 120mm. Any shorter and things get a bit sketchy especially on fast descents. Any longer and well, you should be in the pro peloton! They usually ride bikes one or even two sizes below the "norm" which is why they use long stems. My advice is if you are between sizes get the smaller model. Besides the obvious benefit of a lighter frame, the smaller size gives more scope to increase the stem length and raise the saddle if necessary. If the bike is too big for you, you can run into adjustment problems where the stem gets too short and the seat post is further into the seat tube than might be desired. Believe me I've been there on both counts based on a manufacturer's sizing chart for my height. Obviously the best route is get a bike fit by a recognised independent bike fitter (not a shop). Failing that at least get a test ride on (or hire) the proposed bike in the size you think suits you. Make sure you pay attention to the length of the stem especially and the height of the saddle. Obviously the basic geometry of the frame as well including top tube length, head tube length and seat angle. Stack and reach are not so important in my opinion. You really need to primarily check the relationship between where you will be sitting and where your hands will be. Stack and reach don't really tell you that.

[@dcv9460]

Awesome advice 👍🏽

[@Sniper5354]

There is no golden rule for selecting the right bike size. But there is a golden rule that you have a very high chance of getting a wrong bike size, that is, when your bike fitter happens to also be the salesperson who has a very limited stock to choose from.

[@Suedesi]

Awesome content

[@ingguidesmedia]

Thanks!

[@stefanomancini6569]

Thanks for taking my question! Yes I do have racers name! Do you think a 75 milimetre stem is to small on a road bike thats what Im riding now.

[@ingguidesmedia]

You’re welcome Stafano. Thanks for the great question. I don’t see a problem running a 75 stem. We checked your channel and it looks like your stem is appropriate for your frame. Btw, that Trek Emonda is fire 🔥. Jack

[@stefanomancini6569]

@@ingguidesmedia thanks for checking out my channel. Frame size 47. Yeah baby! Lightweight!

[@ingguidesmedia]

Stefano Mancini not just checked out. We subscribed man!

[@jomardemesa4010]

Hey jack could talk about more on biomechanics?

[@ingguidesmedia]

Probably. Anything specific you’d like to see addressed?