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  1. #1
    Junior Member
    Join Date
    Mar 2005
    Location
    Los Alamos, NM, USA
    My 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.

    http://www.bikeparts.com/search_resu...p?ID=BPC304049

    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

    http://www.universalcycles.com/shopp...0&category=515

    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.

  2. #2
    Senior Member Joshua A.C. New's Avatar
    Join Date
    Aug 2007
    Location
    Northampton, MA
    My Bikes
    Iron Monkey: a junkyard steel 26" slick-tired city bike. Grey Fox: A Trek 7x00 frame, painted, with everything built, from spokes up. Jet Jaguar: A 92 Cannondale R900 frame, powder coated matte black with red and aluminum highlights.
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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.
    Joshua A.C. Newman,
    Passionate lover of construction

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