• 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/

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