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Latest discussions at Pit Bike Club:
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03-10-2013, 07:34 PM
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#1
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Training
Join Date: Mar 2009
Age: 35
Posts: 198
Bike: CNC 177cc v2!
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Sprocket combinations.
I'm currently running a 17T on the front sprocket, I use the bike for supermoto and at red lodge the other day as I'm only hitting the top of third I've got a 14t front sprocket, how much will that affect the gearing as it's a bit of a jump. I don't wanna be bouncing valves before getting to the end of the straights in fourth.
Cheers
Ryan.
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03-10-2013, 10:35 PM
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#2
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Wheelie King
Join Date: Nov 2010
Location: North Yorkshire - Scarborough
Posts: 2,032
Bike: Pitster LXR/KTM
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Re: Sprocket combinations.
1 tooth on the front is 3 teeth on the back, i'd go for a 15t on the front 
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04-10-2013, 04:33 PM
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#3
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Training
Join Date: Mar 2009
Age: 35
Posts: 198
Bike: CNC 177cc v2!
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Re: Sprocket combinations.
So 15T on the front, will I need to change the rear sprocket I'm currently running 38T on the back. What is the ideal T for the rear if running a 15T on the front?
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04-10-2013, 04:35 PM
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#4
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Track Master
Join Date: Jul 2013
Location: Hartlepool
Age: 36
Posts: 315
Bike: WPB 140cc CRF70
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Re: Sprocket combinations.
Quote:
Originally Posted by James116
1 tooth on the front is 3 teeth on the back
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Can someone explain exactly what this means lol
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04-10-2013, 08:51 PM
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#5
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Training
Join Date: Mar 2009
Age: 35
Posts: 198
Bike: CNC 177cc v2!
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Re: Sprocket combinations.
Quote:
Originally Posted by Jonowilliams
Can someone explain exactly what this means lol
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Taking 1 tooth off the front sprocket is the same as taking 3 teeth off the rear sprocket. (It's not exact but close enough.)
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05-10-2013, 10:37 PM
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#6
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Training
Join Date: Apr 2012
Posts: 164
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Re: Sprocket combinations.
Quote:
Originally Posted by imnobby
Taking 1 tooth off the front sprocket is the same as taking 3 teeth off the rear sprocket. (It's not exact but close enough.)
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Correct. Not been to redlodge for ages but going for the last round of nmrrc a week tomorrow and I'll be starting off 16 / 39 and see how that goes.
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06-10-2013, 10:10 AM
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#7
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Training
Join Date: Mar 2009
Age: 35
Posts: 198
Bike: CNC 177cc v2!
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Re: Sprocket combinations.
Quote:
Originally Posted by Trick
Correct. Not been to redlodge for ages but going for the last round of nmrrc a week tomorrow and I'll be starting off 16 / 39 and see how that goes.
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I ran a 17/38 round there last week and didn't need 4th gear! That's why I'm dropping 2t on the front I just do t know how drastic it will affect things.
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06-10-2013, 10:38 AM
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#8
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PBC Veteran
Join Date: Mar 2009
Location: Dereham
Age: 31
Posts: 3,476
Bike: 140EliteSM
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Re: Sprocket combinations.
I run 16/39, its a good starting point, and for lazy gits like me who cant be bothered to change it (or more to the point dont have a whole bunch of sprockets) it will get you round most tracks without issues.
It depends a lot on how quick you are riding, if your getting on the throttle earlier coming onto the straight you will top out earlier.
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06-10-2013, 11:03 AM
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#9
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PBC Legend
Join Date: May 2009
Location: Where ever i leave my hat
Posts: 7,794
Bike: A big pumpkin
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Re: Sprocket combinations.
Quote:
Originally Posted by imnobby
Taking 1 tooth off the front sprocket is the same as taking 3 teeth off the rear sprocket. (It's not exact but close enough.)
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Going less on the front is like adding on the rear. (approx 1 on front = 3 on rear)
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23-10-2013, 02:06 PM
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#10
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Novice
Join Date: Oct 2013
Posts: 17
Bike: pit bike
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Re: Sprocket combinations.
Hi Guys,
could you tell me the best combo of sprockets for a road legal pit bike for a 125cc. I'll be running on 14" rear wheel and 17" front wheel if that helps, I've only had road bikes previously so wanting you advice from your experience.
Cheers ALAN
Sheffield S25.
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