Fitting 1 1/8th" Stem to 1" Fork Steerer - DIY BODGE REQUIRED

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Fitting 1 1/8th" Stem to 1" Fork Steerer - DIY BODGE REQUIRED

8 posts & 6 voices | Started 1 year ago by namastebuzz | Latest reply from namastebuzz

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namastebuzz - Member

OK I'm putting together a TT Bike for an event tomorrow. The bits arrived yesterday but the shim that should have (presumably) been with it didn't.

The stem (alloy)is for a 1 1/8th" steerer but the forks have a 1" steerer (carbon). THe stem is part of a one piece aero bar set-up so I can't just swap it out.

Can't get a shim from any of the local bikeshops and although I can get one off the web for £3 I can't get it TODAY.

Any ideas? Can you get 1/8th" thick washers with an internal 1" diameter anywhere?

Posted 1 year ago #
h4muf - Member

Where are you based?

Posted 1 year ago #
splitlip - Member

If there's a Halfords near you could try one of these,
steerer adapter
I think they come with 2 shims that you'll be able to use.

Posted 1 year ago #
spandex_bob - Member

The missing shim (not inside the stem clamp is it?) is probably just a rolled piece of ali sheet. Thickness-wise you need to add 1/16th (or 1.5875) to the steerer to take it out to 1 1/8th, which handily is a pretty good match for 16 gauge ali. Where abouts are you based - got loads of off-cuts which are just the job here in sunny Macc!

(Usual caveats about death resulting from bicycle bodgery advice gained from internet weirdos apply)

Posted 1 year ago #
pastcaring - Member

you need a shim 1.5875 mm? the only thing i can think of that might be available is a seat post shim.

or make your own from soft plastic (cd box, bucket) guessing you wouldn't want to use coke can shims on a carbon steerer.
fit plastic shim, tighten ad the check it doesn't slip. wouldn't want you turning one way and the bike going another.

Posted 1 year ago #
h4muf - Member

I've got one.

I'm in derbyshire though.

Posted 1 year ago #
dnchevy - Member

if your anywhere neer bracknell have a spare shim

Posted 1 year ago #
namastebuzz - Member

Thanks for all the replies everyone.

I'm actually in Aberdeenshire

My internet crashed a few mins after the post and didn't get fixed (by 2 engineers) 'til monday night.

Anyway, went along the lines of splitlip's idea and got a steering adaptor, which had shims with it, and got the bike up and running i time for the event.

Cheers for all the suggestions

Posted 1 year ago #

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