LuckyPierre wrote:mikesbytes wrote:With all the trouble you seem to be having with getting the right chain ring, have you considered changing the cassette ?
Given that your daughter's effectivley using a 12-13-14-15-16-18-21-24 cassette it would be worth experimenting with Mike's idea. It shouldn't be too hard to find an 8-speed mtb cassette to play with. I realise that the rear derailleur will have a 'maximum number of teeth' it can handle, but I don't know what the impact of 'locking out' some ratios will be. Any HG cassette is a potential candidate for experimenting. It could be interesting to see whether a 7-speed would work, given that not all of the cassette is being used - I can send you a couple of them to play with. Extending this line of thinking, a 12-27 9-speed is also a candidate (because most 8-speed hubs are 7/8/9-speed compatible), but I need my granny gear more than your daughter does!
A 7 speed would fit a shimano hub, with the addition of a spacer, but it may not work with the shifters and chain due to different spacing.
14 - something cassettes are quite common.
Possibly you may need to fit a long cage rear derailier, but then you will have a spare one and derailiers arn't 8/9/10 specific.
Have a nice day