Sprocket advice

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solved Sprocket advice

Post  Richard houlton on Sun May 14 2017, 20:05

After noon peeps richard here
Looking for sprocket ratio advice had a 15 front 45 rear ratio now at stock 15 47 and the difference is somewhat noticeable could anyone recommend a decent sprocket setup ?
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solved Re: Sprocket advice

Post  The White One on Mon May 15 2017, 11:13

Depends what your looking for, -1 front and +1 rear, I just went for the simple +2 rear, better acceleration just lose on the top end but when would you need it.
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solved Re: Sprocket advice

Post  weasley on Mon May 15 2017, 12:27

+2 on the rear reduces the gearing by about 4%, so you'll lose 4% off the top end in all gears but will (very simply) gain 4% in acceleration. In reality this may change because you will be shifting gears more often with lower gearing. You will also see a theoretical 4% drop in fuel economy (but again this may change as you will ride it differently).

+1/-1 leads to a more dramatic change: 9% reduced gearing. Same effects apply as above, but you may find 1st quite short and may even not bother with it at all.

As TWO says, it depends what you want to achieve. You'll have to think about chain length too if you get too extreme.
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solved Re: Sprocket advice

Post  Eddie990 on Tue May 16 2017, 08:55

-1 on the front equates to roughly +2 on the rear.

Check out http://www.gearingcommander.com/ if you want to see what changing the sprockets will do to your revs/gears, theoretical top speed and chain length (wheelbase).

Reducing teeth on the front sprocket will accelerate chain wear as it need to turn tighter and will decrease chain/swingarm clearances. Increasing the number of teeth on the rear without lengthening the chain will reduce wheelbase making the bike more nimble but less stable.

Best advice is to try it and see how you get on, I have several sprockets for my track bikes and change them out all the time depending on track and condition. It's not a difficult job, I can have the wheel out, sprockets changed and wheel fitted again in around 10-15 mins.

Almost all of my road bikes have benefited from going -1 on the front sprocket.

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solved again thanks

Post  Richard houlton on Wed May 17 2017, 15:06

hi all
thanks for the advice will keep it at stock at the moment till after the respray safe riding all
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solved Re: Sprocket advice

Post  SteveCat on Wed May 17 2017, 21:59

great
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