Low stack height stem

[Roly]

Hi there
I'm after a stem with a really low stack height i.e about 30mm?
Wotcha got?

Roly, owner of a really short steerered fork!

 

[suburbanreuben]

Syntace stems have low stack heights, only needing 32mm of steerer...

This one needs less than 29mm! http://www.syntace.com/index.cfm?pid=3&pk=1518

Pricey, but can be had for a fraction of that on the bay.

 

[adieujoliecandy]

I'm having the same problem as you and am currently looking to get a DMR Defy. It has a 31mm stack height but it only comes with a 50mm length
http://www.dmrbikes.com/products/stems/defy

 

[Roly]

I've waved a tape measure near it today and the exposed steerer is abooooooooooout 24mm.
I wonder how much those DMR ones are...

 

[suburbanreuben]

I've waved a tape measure near it today and the exposed steerer is abooooooooooout 24mm.
I wonder how much those DMR ones are...

You need a Crank Bros headset then, with a 20mm stack height.

 

[zaskar.le]

If he has 24mm from top race a 30 mm will do as you don't want top of steerer above stem and need bit below top to get it fitted you could get away with with a thicker one if stuck as long as the top caps expander is inside steerer ok(if you had 20mm and went with a 40+ thick stem you could have problem's but 10 mmish +/-is ok from top of steerer tube to top of stem.
The main thing is that it's above top line of stem line ie where it goes to bars plus being low/on top of top crown less leverage on steerer tube.
The only time it's a problem if your jumping/pulling up on bars type of thing but then you'd not be using ali/carbon steerer's.

 

[suburbanreuben]

If he has 24mm from top race a 30 mm will do as you don't want top of steerer above stem and need bit below top to get it fitted you could get away with with a thicker one if stuck as long as the top caps expander is inside steerer ok(if you had 20mm and went with a 40+ thick stem you could have problem's but 10 mmish +/-is ok from top of steerer tube to top of stem.
The main thing is that it's above top line of stem line ie where it goes to bars plus being low/on top of top crown less leverage on steerer tube.
The only time it's a problem if your jumping/pulling up on bars type of thing but then you'd not be using ali/carbon steerer's.

Dangerous advice!
(even if you can understand it)

 

[zaskar.le]

Well don't forget when you tighten up it pulls down on bearings so it increases slightly(well only been in the trade 30 years so what do i know?)

 

[cyfa2809]

Spank spike at 26mm I believe. I run one as I have the same trouble. Solved all issues. Hope headset is 30mm stack also? (but obviously better than the CB one, trade off).

 

[Dead Rats]

yeah, most modern BMX stems could do the job, but they only generally come in fairly short reach and (I think) with non OS bar clamps (or even 22.2mm)