Warwickb
Group: Members
Posts: 1911
Joined: Sep. 2003 |
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Posted: Dec. 06 2007,23:50 |
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Screen shot from a gearing calculator spreadsheet showing 3XV stock gearing and rear wheel size, and related speeds in each gear etc.
Obviously this kind of stuff is not 100% accurate (diff tyres have slightly differnt heights due to differnt profiles etc.), but it can give quite a useful idea of the effects of different gearing.
It's just a simple excel spreadsheet and all values can be changed (the spreadsheet doing those tricky calulations for those of us who are hard of maths). The one above shows stock final gearing and 3XV 'R' ratios, but these can obviously be adjusted, allowing you to swap the gearbox ratios for SP ones (check the manual) and final gearing of whatever you are running - or thinking of trying. As can max revs, max power etc., for those who have relevant dyno data to give them peak power and rev figures with greater accuracy. For thiose that don't, note that 3XV tacho's tend to over-read by about 1000rpm at the top end, so if your bike stops dead at 11,500 on the tach, for example that's going to be around 10,500 'real' RPM, so that's what you should put in the relevant column - not the tach figures.
If anyone wants a copy, just mail me and I'll forward it to you.
Be aware though that a stock 3XV just aint gonna pull that 30 tooth rear and give you 150mph at 12000 rpm - unless you find a very big hill 
Cheers
Wb
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A garage overflowing with old stinkers...
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