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Old 04-02-2010, 05:18 PM   #1
Flamingtire
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Educated estimate on RPM difference 15t vs. 16t

I will shortly be swapping my chain on my 2002 R6. Everyone (like literally everyone) tells me to go down one on the front sprocket. However, I ride on the interstate quite often.

When I ask "everyone" what the RPM difference will be in 6th gear going like 75, all they can say is that you will hardly notice it. I would like a more educated estimate/approximation on this difference. I pretty mechanically inclined, therefore I'm sure I would notice the different engine tone and tach reading...

So, anyone have any thoughts? The current setup is 16 48 (stock).
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Old 04-02-2010, 06:03 PM   #2
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Re: Educated estimate on RPM difference 15t vs. 16t

almost 1,000 rpm more for same speed in same gear.
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Old 04-02-2010, 06:04 PM   #3
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Re: Educated estimate on RPM difference 15t vs. 16t

I wish I could remember for you but I can't.

I think it was 500 but not more than 1000 rpm difference.
what I do remember at the track my speed with the stock gearing is about 134 at the end of the straight and with the 15 on the front it went up to 146(indicated) or so.
and with my 14 on the front it went up to 157 or so. (if only it was true LOL)
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Old 04-04-2010, 08:06 AM   #4
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Re: Educated estimate on RPM difference 15t vs. 16t

Well see I would think thats a noticeable difference. Thanks for the replies. Ill assume its greater than 500 less than 1000 at this point. I use my bike for long trips so much that it wouldn't be intelligent to drop one in the front. If it was just my toy for weekend riding I would do it in a heartbeat.
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Old 04-04-2010, 09:39 AM   #5
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Re: Educated estimate on RPM difference 15t vs. 16t

just go up 1 or 2 teeth in the rear. its enuff to make it alittle more fun. but not enuff to make u think your winding the shit out of it just going down the highway. it will make about a 300-500 difference. at least thats what i would do.
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Old 04-04-2010, 09:55 AM   #6
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Re: Educated estimate on RPM difference 15t vs. 16t

It changes your overall gear ratio by 7%. A little less than 1,000 rpm and highway speed, very noticeable.

Gear Ratios - Motorcycle Front/Rear Sprocket Combinations

14 15 16 17 18 19
49 3.50 3.27 3.06 2.88 2.72 2.58
48 3.43 3.20 3.00 2.82 2.67 2.53
47 3.36 3.13 2.94 2.76 2.61 2.47
46 3.29 3.07 2.88 2.71 2.56 2.42
45 3.21 3.00 2.81 2.65 2.50 2.37
44 3.14 2.93 2.75 2.59 2.44 2.32
43 3.07 2.87 2.69 2.53 2.39 2.26
42 3.00 2.80 2.63 2.47 2.33 2.21
41 2.93 2.73 2.56 2.41 2.28 2.16
40 2.86 2.67 2.50 2.35 2.22 2.11

by webBikeWorld.com

Like scooter said you can go up one or two in the rear for a smaller difference.
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Old 04-04-2010, 12:00 PM   #7
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Re: Educated estimate on RPM difference 15t vs. 16t

1/16 = 6.25% difference. So go ride on the freeway at your normal speed, then add 6.25% to that to get what your RPM will be with the new sprocket. I'm not sure where you guys are getting a 1000 RPM gain from unless you're cruising at 16,000 rpm. I'd say a 500 RPM gain is a pretty good estimation.
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Old 04-04-2010, 12:47 PM   #8
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Re: Educated estimate on RPM difference 15t vs. 16t

It is less than 1,000 that is for sure. It is different for different bikes and in different gears.
in 6th it's about a 400 rpm difference. in first it's nearly 800. This is at 60 mph keep in mind. At full speed ahead the difference will be close to 800 in 6th gear. 1 tooth difference in the front makes the largest impact on gearing. The rear is for fine tuning. Basically it works out to about 10 mph difference for the front sprocket. If you go up one you will be 10 mph faster, down one 10 mph slower, at the same rpm in the same gear.
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Old 04-04-2010, 01:33 PM   #9
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Re: Educated estimate on RPM difference 15t vs. 16t

Quote:
Originally Posted by w cole View Post
1/16 = 6.25% difference. So go ride on the freeway at your normal speed, then add 6.25% to that to get what your RPM will be with the new sprocket. I'm not sure where you guys are getting a 1000 RPM gain from unless you're cruising at 16,000 rpm. I'd say a 500 RPM gain is a pretty good estimation.
i said 3-500.. so don't lump me in with a bunch of smart guys ok. lol
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Old 04-04-2010, 03:05 PM   #10
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Re: Educated estimate on RPM difference 15t vs. 16t

Quote:
Originally Posted by luke geis View Post
If you go up one you will be 10 mph faster, down one 10 mph slower, at the same rpm in the same gear.
it actually reads faster than you are going on the display. but it gets more off the faster you go.
every time I hit the braking marker with stock gearing in my videos I'm at 134 +/- 1-2 mph

with the 15 on the front that jumps up 10-12mph. I might actually be going a little faster. but I doubt its all that much faster. but it doesn't really matter to me, I like how I get up to top end faster.
that's what it's all about. because with stock gearing I can't keep up with my buddies 04 that makes 109hp at the rear wheel. after about 110 he pulls about 5 bike lengths on me. but with the 15 I can stay with him a little bit more. but with the 14 I have no worries of him leaving me behind like he does when I use the 16/48.

Last edited by blue03r6; 04-04-2010 at 03:14 PM.
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