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Will a standard road bar (26.0mm) work in a mtb stem (?mm)?(6 posts)

Will a standard road bar (26.0mm) work in a mtb stem (?mm)?Ken of Fresno
Apr 9, 2002 3:18 PM
I'm going over my stem options and there seems to be some variation on mtb stem clamp diameters. Has anyone used a mtb stem on a road bike? Which brands worked for you? I'm looking at a Ritchey Pro stem in particular.

Yeah, probably, I think, pretty much, sort of... I've done it.cory
Apr 9, 2002 4:09 PM
I used to know the numbers, but I've forgotten them... I THINK the MB standard is 25.4, but I'm not sure, and I'm not even sure there IS a standard anymore...
To answer your basic question, though, I've used Ritchey mountain stems on two road bikes with the drop bars the bikes came with, to get them up where I wanted them. The bars slid in easily and held securely. It may be significant that in both cases the stems were steel, so I wasn't at all worried about opening the clamps half a millimeter if I had to. It's been a few years, but I don't remember that I did.
re: Will a standard road bar (26.0mm) work in a mtb stem (?mm)?ishmael
Apr 9, 2002 4:31 PM
they arent supposed to go together....i wouldnt risk it, what if it breaks..besides ritchey makes a pro stem in road diameter anyway
Not exactly true...Ken of Fresno
Apr 9, 2002 5:09 PM
Thanks for the tip. I checked Ritchey's site and found that the clamp diameter for their mtn and road stems is 25.8mm. Strange. Seems like it may work ok with both (but not perfectly with either???). Still dunno for sure.
Won't Really Work...timfire
Apr 10, 2002 5:47 AM
The mountain bike standard is 25.4mm. A standard 26.0 road bar will NOT fit into one of those safely. I know half a mm sounds small, but I've tried to fit my drop bar into a mountain stem and it just didn't fit right (and it was a 25.8mm Ritchey drop bar on top of it all).

However, you do have another option. Bontrager makes a cyclocross drop bar with a 25.4 stem clamp. You could use that with a mountain stem. That's actually what I'm going to do, I've ordered the parts but I'm still waiting for them to arrive.

--Timothy Kleinert
I wouldn't do it.Spoke Wrench
Apr 10, 2002 5:56 AM
I don't like to take chances with the front of a bike. You might want to refer back to my post on the broken collarbone thread.

Anyway, you can buy road-style handlebars in the 25.4 clamp size and many stem angles are offered with 26.0 clamps. There are ways to cobble together a mix and match combination, but you're either risking a loose handlebar or else putting the whole clamping load on four points.