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Old 05-30-15 | 08:12 AM
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ThermionicScott
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Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers), All-City Space Horse (hers)

Originally Posted by Bike tinker man
A photo & the exact Shimano part number would be helpful, I've a couple of these older ones myself & I'm trying to understand better what you are saying
It's an MF-TZ21 freewheel, 14-28. Here's a picture, although it's hard to capture a 1mm difference with an iPhone:

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