How do I know my stem length?
 

Hi all, in the works for a custom build, and was wondering what stem length is right for me... before I buy one. Is 120mm just the default and usually ok, or do I need to try out lengths in the shop somehow before I get one?

120mm Is pretty much default I think. Though, I couldn't get used to my 120mm and am currently riding with an 80mm (yes, short...). Best thing to do is see if a shop has the posibility of trying out different stems, maybe through a fit program or something?

there is no "default" stem length that will work for everyone, or even most people.

Typical stem lengths are 90-110mm. The stem length that will work for you depends on how your body fits to your bike.

Depends on the size of the bike, generally the larger the bike, the longer the stem that comes standard with it.

Correct.

If you are "in the works for a custom build" then you should be either a) working with an experienced fitter who will dial you in correctly or b) know exactly what you need.

If it's b) then you should still validate with a).

competitevecyclist.com

do the fit calculator

People who don't know what they are talking about should avoid giving any advice.

Pretty sure by "custom build" he means he is picking out the parts and assembling it himself rather than having a custom frame made ;)

I don't know, why don't you ask her?

haha yeah, that's correct. Realized that term could be misleading, but I'm currently building up an S1. It's a 56cm, so right in the middle in terms of bike size.

I'll give the fit calculator a try and see what it tells me, though I am a bit skeptical about formulaic determinations of fit.

Calculator is a place to start, and you can modify from there as needed. 100mm is pretty common for that frame size and is fairly neutral... Would not be a bad place to start either.

you should be even more skeptical about asking people on the internet to help you with fit, especially when they know nothing about you, other than your frame size :)

Thanks, I'll check it out. Heading down to Helen's tomorrow for a more complete idea and to try out some sizes.

I took a calculated risk with that. ;)

One can only hope so.