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Will an ACS 13T X 3/32 Crossfire freewheel fit an All-City Standard 130mm fixed/free Hub? I am attempting to setup a goldsprints setup using a very large front ring and a small rear freewheel. I'm not sure whether a freewheel this small will thread on to these hubs.

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Not a direct answer to your question, but instead of using a freewheel hub, you could use a cassette hub and simply run the chain around a single 11t sprocket. You'd have to adjust for chainline in the front. – lantius Jan 16 '12 at 0:12
I found the following on All ACS freewheels feature chromoly sprockets with 4 pawls (2 pairs engaging alternately), for quick engagement. ACS 16T - 22T freewheels thread on Standard English hub threads, and remove with the ACS universal removal tool. "All ACS 14T and 15T freewheels thread onto smaller, metric 'BMX Flip-Flop' threads, and are removed with the ACS 14T removal tool. You may need to remove your hub axle for the tool to have clearance. ACS hubs have a slide-off shoulder to give the tool necessary clearance. – Benzo Jan 16 '12 at 20:49
So it looks like the smallest I can use is 16T. – Benzo Jan 16 '12 at 20:51

No. Freewheels that small use a smaller diameter thread intended for BMX hubs. The smallest freewheel you're going to find for that hub is a 15T. I believe ACS makes one in 15T called Claws that fits a standard hub. Cheap and it works.

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up vote 0 down vote accepted

No, only 16T through 22T ACS freewheels use english threading found on the all city hubs.

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Adventure Components (AC, not ACS) makes (or made?) a 15t freewheel that threads onto a standard 1.37" x 24 hub. I use it on my folding bike with 20" wheels. The bearing design means it has a fair amount of slop, but it is pretty cheap. – lantius Jan 16 '12 at 21:01
It appears that the 15t freewheel still exists and is available on amazon. – Benzo Jan 17 '12 at 17:02

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