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Old 06-08-08, 10:13 PM   #1
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Location: Los Alamos, NM, USA
Bikes: Marin Muirwoods and a cheap steel road bike that I picked up for 20$ on craigslist and which is still in pieces
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aerobars and 25.4 bar

ok, so I ride a marin muirwoods (it's an 05, I think, although I could be confused and it's an 04, but I think they have the same "problem" anyway), which has a 25.4mm handlebar (at the clamp, which I now know is obvious). Anyway, off I went and I bought a set of profile T2+ (because it can be set with the pads behind the bars, which is good), thinking "The package says it will fit 26mm and 31.8mm bars. Surely, 26mm is just a shortcut for 25.4, nobody has two standards 0.6 mm apart."

How wrong I was... Which prompted me to think "I'm a bloody idiot" and "Why, oh why did I not thoroughly read Sheldon's handlebar article before?" I did my homework afterwards, read Sheldon Brown's stuff on handlebars, realized that 26inch handlebars are really only made for road bikes, realized that if I got a "road handlebar" (is that the proper term? handlebars with drops), I'd have to get new brake levers (and essentially new brakes), etc etc. That was until I realized there is such a thing as a handlebar adapter, which I'm guessing is meant to fit a 25.4 handlebar inside a 31.8 stem.

The only problem is that the adapter is 44mm long, which I don't have on either side of the clamp before the rise. So one option might be to get some straight bar like this

and use two sets of those shims. One problem I can imagine is that the tapper to the 22mm section appears too quickly and the shims aren't going to sit properlybecause they're straight.

I guess what I'm asking is "Is there a way to shim such aerobars properly to sit on a 25.4mm bar?"

I have tried only with the supplied 26mm shims and while it holds it's on weight, it slips easily. I have tried to use rubber shims, but that still slip, although only when riding. Is there such a thing as a short 25.4-->31.8 shim? I know I could cut the shims I linked to earlier, but I don't have access to good machines here, although maybe I should look harder. Any ideas?

Thanks quite a bit.
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Old 06-09-08, 12:32 AM   #2
Joshua A.C. New
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You only need to make up the .6mm, though, right? Try cutting a strip out of a beer can and wrapping it around the bar.
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