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The rear 5/6 cogs will probably be one unit
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Does anyone know
Shimano knows. Look up the EV for any cassette you're interested in by googling, e.g. "CS-HG500 EV PDF"
This shows the eight largest sprockets on the 11-34 are more or less permanently joined together. Making a 9-speed 13-34 would be easy, making an 11-30 would be particularly taxing in this instance because 30 and 34 are riveted to the same spider.
fizzy.bleach
gbj_tester
@Jonny69
My ongoing gear quandries. I'm adding more gears to an older bike while maintaining the 126mm rear spacing and 7-speed Shimano freehub. I've worked out that you can fit 9 gears on the 7-speed body by using 9 of the gears off a 10-speed cassette. I just need a cassette which comes apart. Does anyone know if the 11-34 Shimano Tiagra HG500 10-speed cassette can be taken apart into separate cogs and spacers?
Edit: this one: http://www.wiggle.co.uk/shimano-tiagra-hg500-10-speed-cassette-11-3211-34/