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@mmccarthy
Yeah I checked it out on this http://software.bareknucklebrigade.com/rabbit.applet.html
Currently about 70, 15t would be around 75, 14t would be around 80, I think the 15t will be suffice as I can comfortably make the hills on my normal ride (Uxbridge > Central London via Uxbridge Road) with the 16t but just don't have the top end I want.
Taken the warning about knee strain, maybe i'll just wait until i'm too comfortable with the 15t after a while =P
Thanks for your help, it's greatly appreciated.