tbr7 sprocket ratios??

JEC249 · 07-01-2020, 02:45 AM

I purchased a tbr7. Im mostly riding on road so i need more top end. ive got mikuni knockoff with 115 main, open cone shaped filter, ebay special exhaust, and i ported the intake, ported and polished exhaust. Ive noticed most people run a 17 tooth front sprocket with a 42 tooth rear sprocket for on road use. Well my dilemma is Amazon is fresh out of 42 tooth sprockets. I was wondering if going down to a 16 tooth front sprocket and down to a 40 tooth rear would be suffice? I know that the ratio for 17/42 turns out to be 2.47and some change to 1 and a 16/40 comes out 2.5 to 1 ratio. Would that 0.03 make much of a difference?

Megadan · 07-01-2020, 03:25 PM

.03:1 is not enough to notice. Effectively it is the same gear ratio, so if that is your option, go for it.

jmb1911 · 07-03-2020, 03:17 PM

16/40 is what I run. I still have plenty of bottom end grunt and it will top out at 68 mph with my big ass on it.

JEC249 · 07-17-2020, 10:13 PM

Okay thanks guys!

07-01-2020, 02:45 AM	#1
JEC249 Join Date: Jun 2020 Location: Calhoun City, MS Posts: 8	tbr7 sprocket ratios?? I purchased a tbr7. Im mostly riding on road so i need more top end. ive got mikuni knockoff with 115 main, open cone shaped filter, ebay special exhaust, and i ported the intake, ported and polished exhaust. Ive noticed most people run a 17 tooth front sprocket with a 42 tooth rear sprocket for on road use. Well my dilemma is Amazon is fresh out of 42 tooth sprockets. I was wondering if going down to a 16 tooth front sprocket and down to a 40 tooth rear would be suffice? I know that the ratio for 17/42 turns out to be 2.47and some change to 1 and a 16/40 comes out 2.5 to 1 ratio. Would that 0.03 make much of a difference?
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07-01-2020, 03:25 PM	#2
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,110	.03:1 is not enough to notice. Effectively it is the same gear ratio, so if that is your option, go for it. __________________ Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124
	1

07-03-2020, 03:17 PM	#3
jmb1911 Join Date: Feb 2020 Location: Alabama Posts: 10	16/40 is what I run. I still have plenty of bottom end grunt and it will top out at 68 mph with my big ass on it.
	1

07-17-2020, 10:13 PM	#4
JEC249 Join Date: Jun 2020 Location: Calhoun City, MS Posts: 8	Okay thanks guys!
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