Sprocket Gearing question - Honda Rebel 300 & 500 Forum
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post #1 of 19 (permalink) Old 09-03-2017, 01:56 AM Thread Starter
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Sprocket Gearing question

Ok so I'm putting this here because I don't know where to actually post this. So the 500 tops out for me (a 230 lb man) at about 95 mph, but this happens in 5th gear. Since there still seems to be some headroom (6th gear) I was thinking of changing the sprockets to gain some mechanical HP. I know the mpg will take a hit but the $6 a week fill up right now is not keeping me up at night. I wanted to play around with Gearing Commander but I don't have the info needed, eg primary drive ratio, final drive ratio, chain pitch and chain links. Any one have the info? Here's the URL to Gear Commander ( http://www.gearingcommander.com ) what do you guys think a good idea?
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post #2 of 19 (permalink) Old 09-03-2017, 05:31 AM
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Someone has already done this, but not sure if it was a 300 or a 500 thou.
But there is a thread here somewhere.

But in regards of the 6th gear, you won't be able to gain any more speed from it. The bike max out at 105 mph, doesn't matter if you're in the 5th or 6th gear. So the 6th gear is simply a cruising gear to get the mpg down a notch. Nothing else. If you want higher speeds you need higher ccm.
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post #3 of 19 (permalink) Old 09-03-2017, 05:44 AM
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Found it:

https://www.hondarebel3forum.com/foru...-up-front.html

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post #4 of 19 (permalink) Old 09-03-2017, 10:07 AM Thread Starter
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Ok so mechanically I would hit the Rev limiter in 5th gear at 105. Where do you think I can get the Gearing info for gear Commander from?
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post #5 of 19 (permalink) Old 09-03-2017, 10:23 AM Thread Starter
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And keep in mind I'm not trying to gain top speed. I was just kind of guessing there might some room to raise the oomph without loosing so much top end speed since there is still a sixth gear left.
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post #6 of 19 (permalink) Old 09-03-2017, 11:04 AM
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Since it's the same engine from the CBR bikes, I would start looking there. There will be some difference thou, since Honda re-tweaked the engine when they put it in the 2017 Rebel. So the engine allready has better "oomph" as you call it, than the CBR bikes.
Exactly what Honda did to achieve this I do not know. Could look into that, see if it's possible to gain even more from whatever they did.
Besides this, I do not know. The Rebel ain't meant to win any street races, so can't really see the need for anymore "oomph", but to each their own ofc.
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post #7 of 19 (permalink) Old 09-03-2017, 11:29 AM Thread Starter
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Yeah I get that. And it's not so much I want to win any street races but if there is a little more in there that can be had without sacrificing too much why not
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post #8 of 19 (permalink) Old 09-05-2017, 02:58 PM
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I geared mine to drop the RPM's on the highway. So overall I lost a bit of off the line and overall acceleration, also mine is the 300. I was able to use cbr300 sprockets. Hopefully the 500 CBR sprockets could interchange as well.

2017 REBEL 300 ALL STOCK.
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post #9 of 19 (permalink) Old 09-06-2017, 09:16 AM Thread Starter
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Yeah me too. I'm hoping to do the opposite actually trade a little top speed for some power
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post #10 of 19 (permalink) Old 10-21-2017, 02:48 AM
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Quote:
Originally Posted by Ferndois View Post
Yeah me too. I'm hoping to do the opposite actually trade a little top speed for some power
You don?t really need to work it out to the end degree. All you need to do is either put on a bigger rear sprocket or a smaller front sprocket. 1 tooth on front is roughly equal to 2.5 teeth on rear. You may have to lengthen the chain if you go with the larger rear sprocket. If you have the ABS model to speedo should stay true. If not, you may need a speedo healer.
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