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DT125R Forum -> Tuning -> Road speed vs Engine Speed Graph
Post Info TOPIC: Road speed vs Engine Speed Graph
RudiRulez


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Road speed vs Engine Speed Graph
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Was doing some comparisons between a 16 and a 17 tooth front sprocket, this is all theory im yet to put it into practice but the software was setup correctly (for my bike) so therefore should be more accurate than what the speedo and rev counter read.

Front 15    Rear 57


Front 16    Rear 57


Front 17    Rear 57


Front 18    Rear 57




Both of these are for a yamaha DT125R upto 04, but they may suit the 04 onwards and maybe even the DTX.

Please remember this is all theory, in practice putting a bigger front sprocket on doesn't always mean a higher top speed, the bigger you go the more strain you place on the engine untill eventually the engine wont have enough power to gain the revs to get the bike upto speed, these graphs are just to help you find a balance between speed and acceleration!


-- Edited by RudiRulez on Sunday 17th of January 2010 12:30:54 AM

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satelliteone


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ive been using the 17th tooth for quite a while now. standard rear.. I like it.. nice comprimise over acel and top end.

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RudiRulez


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oh wow my first ever stickied thread, thanks, if anyone is interested i can make some more graphs with different sized front or rear sprockets.

@satelliteone, i think i might change to a 17 just for the sake of making first gear last a little bit longer, is the loss in acceleration noticeable from what you can remember?

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plebpl


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seeing what a 18 is like would be nice mate :) if you could make a graph for that i would be interested to see the results

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craigbulmer


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can you make a 15 tooth one?
interested to see what it would be like :D:D

cheers

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Yamaha DT125R - 2003
RudiRulez


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will do guys, i will add them to the first post once they are done.

EDIT: they're up.

-- Edited by RudiRulez on Sunday 17th of January 2010 12:31:29 AM

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plebpl


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wow quite a big diffrence :S

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craigbulmer


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useful.

going onto a 15 tooth. Cheers smile.gif

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Yamaha DT125R - 2003
NathanDavies


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how bout 14 tooth thats what i got in?

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craigbulmer


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Youve put a 14 tooth on a road bike? rag rag rag lol

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Yamaha DT125R - 2003
NathanDavies


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haha yeah, im goin upto 15 tooth it screams at 70, really screammss

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bkray


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i was gonna go down too 14 >.> bad idea?

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1990 DT125R Sm'd

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craigbulmer


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try a 15 first

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Yamaha DT125R - 2003
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