Rear Sprocket

[Mini_Stalk]

Hello i am thinking of getting a 3 tooth less sprocket for my yamaha sr 125 but as i understand it, it will lower my accelaration so would it be worth getting a different frount sprocket.

Thanks
Dave
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SR 125 Rat

[Paxovasa]

What do you want?

A smaller front or larger rear sprocket will give you better acceleration. If you do both then there will be no difference.

Fitting a smaller front sprocket will give you better acceleration and it might improve the top speed as you may be able to redline it in top gear.
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Suzuki GSF600 K3 (in the fastest colour, black).

[fiery tupp]

If you need a new rear sprocket its best to get the standard size & then you can try either one tooth more or less at the front as these are only cheap & experiment , But with the yam sr 125( Ive just sold one) I wouldn't bother theres not much if anything to gain .
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If you can't fix it with a hammer , use your head .

[Mini_Stalk]

i see, i just want a bit of a better top end cus it pisses me off stitting at 65 everyware.
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SR 125 Rat

[bacon]

[Mini_Stalk]

[RussG]

Yeah smaller front or larger rear.

If the front has to complete more whole revolutions than the rear you should (in theory) accelerate faster
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Geek, father, biker

[Kickstart]

[fiery tupp]

So if you put a bigger sprocket on the front less acceleration setting off & at lower speeds & about half a mph faster top speed when you eventually get there in about mid august sept if its wind is against you & if theres any hills on your route send us a xmas card
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If you can't fix it with a hammer , use your head .

[bacon]

[benlooker]

Hi, i kind of understand the theory behind how changing sprockets can alter acceleration/top end.

I am ready for a new chain and sprocket set for my Honda XL 125 and have been looking at getting a different set ie front -1 and rear +2 to increase the top end.

My bike struggles to hit 65 and is revving very high at 60. Would altering make a noticeable difference in top speed?

I would like to be able to hit 70 and sit at 65 comfortably, or higher if possible but not expecting for anything unrealistic.

[Kickstart]

Hi

Smaller front or a larger rear will LOWER the gearing. Lower gearing = more revs for the same speed. If you are running out of revs then you need higher gearing so a larger front or smaller rear sprocket.

However an XL125 is unlikely to go much quicker anyway. Not much power and a flying crucifix riding position to maximise wind resistance.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Mini_Stalk]

Thank you all for you help
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SR 125 Rat