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Sprockets: What you need to know

This is a discussion on Sprockets: What you need to know within the Grom Performance forums, part of the Honda Grom Garage category; Wow, 36 rear sprocket, no wonder, yeah 16 then. I have 32, going to put on the 15....

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Thread: Sprockets: What you need to know

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    Wow, 36 rear sprocket, no wonder, yeah 16 then.
    I have 32, going to put on the 15.

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    Helps when I'm climbing hills and doing off road stuff. haha
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    I having trouble with the best gear to use, I was at 16/32 & 16/34 . I want top speed but it seem like both are same result mid 60 @7200 rpm. I want to achieve 75-85 mph I'm running koso cam pnp head and koso 170. Am I missing something here. With pcv n wide band

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    ^ similar setup, but w 4v head. I run a 16/35 does well.
    Too many toys? nah. 09 Ducati sport classic, 74 rd350 LC hybrid, 73 RD350, 73 Kawasaki S2a, 67 Kawasaki C2TR 120 Roadrunner, 71 Kawasaki G3SS powered by a CR85 liquid cooled lump, 74 Moto-Morini 3 1/2 strada, 84 Yamaha RZ350, 1962 Ford falcon, 76 Ford maverick, very early 1970 non-us Spec Yamaha R5, 89 Yamaha DT50 bought NEW in 2015, 2015 KTM 390 Duke, 72 yamaha CS5.. . oh.. and 2014 Honda Grom with lots of mods.. (some useful, most not)

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    Quote Originally Posted by n2civicsi View Post
    I having trouble with the best gear to use, I was at 16/32 & 16/34 . I want top speed but it seem like both are same result mid 60 @7200 rpm. I want to achieve 75-85 mph I'm running koso cam pnp head and koso 170. Am I missing something here. With pcv n wide band
    I'd try a larger rear sprocket to try getting the revs up as m in sc runs. Basically you want to match your revs to the power peak of your engine at top speed.

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    exacltly the 183 ish 2v guys and the cams they run are typically lower revving but more torque and they can pull 16/32 however the 170 4v is a higher rpm setup so i have to keep the revs up a bit more, but can comfortably do 75 all day but nearish factory redline with a 140 rear tire. i have no desire to cruise the bike at 85 or even 90 but it will do it.
    Too many toys? nah. 09 Ducati sport classic, 74 rd350 LC hybrid, 73 RD350, 73 Kawasaki S2a, 67 Kawasaki C2TR 120 Roadrunner, 71 Kawasaki G3SS powered by a CR85 liquid cooled lump, 74 Moto-Morini 3 1/2 strada, 84 Yamaha RZ350, 1962 Ford falcon, 76 Ford maverick, very early 1970 non-us Spec Yamaha R5, 89 Yamaha DT50 bought NEW in 2015, 2015 KTM 390 Duke, 72 yamaha CS5.. . oh.. and 2014 Honda Grom with lots of mods.. (some useful, most not)

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    Hello new to the Grom.I've got a 2017 and am going to change the rear sprocket to a 35tooth for 3 reasons,1- want to have a little better launch(I'm 220lbs) 2- going to change chain to better grade and 3-the rear sprocket on it has to much radial run out.I right at 200 miles and love this little Grom!Is the sprockets for 2015/2016 the same pitch and mount? Thanks for all that reply and Ride safe!

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    Quote Originally Posted by mikez View Post
    Hello new to the Grom.I've got a 2017 and am going to change the rear sprocket to a 35tooth for 3 reasons,1- want to have a little better launch(I'm 220lbs) 2- going to change chain to better grade and 3-the rear sprocket on it has to much radial run out.I right at 200 miles and love this little Grom!Is the sprockets for 2015/2016 the same pitch and mount? Thanks for all that reply and Ride safe!
    Yes, I believe so, and if your front sprocket is still stock, I'd go a little more and get the 36 rear. You won't lose any top speed until you have enough mods to hit the limiter in 4th.

    I'm 215lbs now, but a month ago I was 235lbs and having a 14t front sprocket completely changed the bike. A 14t front is similar to going up 2-3 in the rear.
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    Quote Originally Posted by Old Goat Ninja View Post
    Yes, I believe so, and if your front sprocket is still stock, I'd go a little more and get the 36 rear. You won't lose any top speed until you have enough mods to hit the limiter in 4th.

    I'm 215lbs now, but a month ago I was 235lbs and having a 14t front sprocket completely changed the bike. A 14t front is similar to going up 2-3 in the rear.
    Instant power, only it revs out so fast.
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    Quote Originally Posted by Old Goat Ninja View Post
    I'd go a little more and get the 36 rear.

    I weigh about 150 and run a 15/36. I would do at least that
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