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No problem. 39T gives you a range of 29-95 inches.
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Depends on the make and model of your mech. It will have a total tooth capacity which is front rings range plus rear cassette range. In your case, it’s 0 + 25 = 25 teeth.
The chain ring size depends on the gear ratios you want. In your case it’s 30-98 inches which is ok for most riding.
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Or you can get a longer brake nut. Either way, it won’t look pretty as recessed rear brake bolts only just protrude beyond the hole in the brake bridge.
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It looks identical to a chuck I bought from Topeak so maybe they have spare gaskets.
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Thanks. I've sent you an email to the address you gave me in the PM so hopefully that will sort it,
Cheers
Yoav -
Genuine parts from the 70's. All prices include postage.
Shimano Dura Ace derailleurs; front mech, rear mech, downtube shifters, downtube cable guide and derailleur hanger £30 SOLD
Weinmann side pull brake calipers £20 SOLD
Tange Allez headset £15
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Never seen a QR rear wheel for track frames with 120mm OLD. I am not sure they even exist. Nearest would be a QR wheel for an old 5/6 speed bike with a OLD of 126mm which I guess could be made to fit with a little brute force.
This might do the trick:
https://problemsolversbike.com/products/shifters-derailleurs/downtube_shifter_mount_-_31244
I’m using one on a modern steel frame. The clamp is substantial enough not to need the anti-slip pip and it fits a modern steel tube set with larger down tube diameter. Reynolds 853 in my case.