eBay has all this stuff, an 8 speed 12-26 cassette will cost maybe $30 more than buying a single cog, if you can find a 26 cog.
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I have a slip on style Campagnolo 8 speed cassette and it is real close ratio.....11/19. Climbing a hill is a bit of a strain with a rear 19.
Is it possible replace just the 19 tooth with a 23+ cog and if so how much?
The current cassette on the bike has a 29 tooth cog so the chain and derailleur have room for a larger cog.....reason I ask is that I just saw a Shimano MTB that had a first gear that was 8 teeth different from "second" gear.
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