Thread: First time cassette question
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Old 03-09-19 | 05:15 PM
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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 The_Joe
I just bought what I believe is either an Exage or RSX rear hub and it's my first freehub. Going onto what is currently a 6 speed frame, will I have any problems with a 7 speed cassette? From what I've read the freehub has capacity for it and I know the spacing is 126 which is correct for my frame. Basically I lack the understanding of how you can fit an extra cog in the same space with the same width chain (current chain is like new and 3/32 wide.).

Additionally, if anyone could point me towards a 13-26/28 cassette I'd appreciate it. I've seen 14-28 HG online and I might do that rather than paying vintage prices on eBay for UG.

Thanks
Careful shopping, any Shimano 14-28 7-speed you see online is likely to be a freewheel, not a cassette. This 12-28 should work (I think RSX was Hyperglide-only): https://www.amazon.com/SHIMANO-Speed...dp/B007Y5HFWU/

Unfortunately, Shimano has stopped making upper-level 7-speed cassettes, so you're not likely to find much except for inexpensive 11-28/12-28/12-32 unless you search for old stock.
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