30.9 reverb with a 31.6 shim

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This topic has 21 replies, 16 voices, and was last updated 9 years ago by johnhe.

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30.9 reverb with a 31.6 shim
cp
Full Member

Now I’ve told myself I need a Reverb, I’d like it to work across two bikes – the C456 with a 31.6 seatpost and the Anthem X29 with a 30.9 post.

USE make a 30.9-31.6 shim – but is anyone using one with a Reverb? Any issues with slippage? Or any other issues for that matter?

Posted 9 years ago

mikewsmith
Free Member

From all the other posts make sure it’s a very long shim.

Posted 9 years ago

bigjim
Full Member

From all the other posts make sure it’s a very long shim.

eh?

Posted 9 years ago

mikewsmith
Free Member

If the shim is too short then you can overstress the frame causing it to crack (not a c456 issue but something from other frames)

Posted 9 years ago

momo
Full Member

I ran a 30.9 reverb in my BFe (31.6 ST) with a USE shim, no problems at all.

Posted 9 years ago

cp
Full Member

yeah, the USE shim is longer than most, about 100mm i believe.

Posted 9 years ago

cp
Full Member

thanks momo

Posted 9 years ago

bigjim
Full Member

Ah that kind of post.

I have a USE shim for this very purpose right in front of me and its about 92mm to the bottom to the collar.

Posted 9 years ago

bails
Full Member

I had a 30.9 reverb in a C456 with the USE shim and it was all fine.

Posted 9 years ago

D0NK
Full Member

running a 30.9 reverb across my mix of 31.6 and 30.9 frames, with a use shim where needed, so far so good, early days tho.
fingers crossed!

Posted 9 years ago

cp
Full Member

cheers all

Posted 9 years ago

ade9933
Free Member

orange 5 and 456C same sizes. yes fine.

Posted 9 years ago

Yetiman
Free Member

Have you ordered the shim yet? I have a USE one in the garage I’d be happy to sell as I’m running 31.6 Reverbs on both bikes now.

Posted 9 years ago

jairaj
Full Member

FYI – I found Superstar’s seat post shims to be a bit longer than than the USE one I had.

Posted 9 years ago

cp
Full Member

Cheers, though they don’t do one in 30.9->31.6 🙁

Posted 9 years ago

Hob-Nob
Free Member

You can home make a longer one. As the 0.7mm difference is the same size as a Tesco 4 pint plastic milk carton.

I used one on my HT as the USE shim slipped with the Reverb – the milk carton was fine, and you can cut it so it’s longer. It was a bitch to fit though.

Posted 9 years ago

Slogo
Free Member

i just bought a 30.9-31.6 shim it was a USE. I had been using a beer can shim.

Item Name: USE SS 30.9mm Seatpost Shims Product Code: HNX7189
Item ID: 121345
Item Description:
Item Style: Seatpost Shim Sizes: 30.9-31.6 / Quantity: 1
Item Price: 6.99

Winstanley bikes.

Posted 9 years ago

mekkenolly
Free Member

Hi Yetiman, do you still have the shim available? If so would be interested. Thanks

Posted 9 years ago

cheers_drive
Full Member

mekkenolly – If yetiman does not reply I have one which you can have for £5 posted. Paypal gift or a bit extra if non gift.
My email is in my profile

Posted 9 years ago

oldejeans
Free Member

I bought two USE shims so that the join between them didn’t end up on a weld for the brace between the ST and TT, and to give me >110mm

Bit of a hassle to get them out of the ST though, and get them to sit in the right place before clamping

Posted 9 years ago

Andy
Full Member

Just an observation on the USE thermoplastic ones…they come up undersized. My 27.2-31.6 measured 31.4 and rattled in the seat tube, which I really don’t want with a shimmed seatpost so I binned it and bought a crank bros aluminium which is spot on.

Posted 9 years ago

johnhe
Full Member

I used the USE shim from Winstanleys and used a 30.9 Reverb in a 31.6 bike for a good while and experienced no problems. I wish I’d stuck with that arrangement – instead I bought a specific 31.6 for my BFe, so now I can’t swap it onto my other bikes.

Posted 9 years ago