Rear sprocket upgrade - Honda Rebel Forum
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post #1 of 15 Old 07-14-2009, 09:02 AM Thread Starter
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Rear sprocket upgrade

I am a new member and am surpirsed that I have not found postings about the benefits of replacing the rear sprocket.

the stock rebel screams at 55 and up. I changed the 33 tooth sprocket with a 30 tooth one and could not be happier. The bike does not buck when taking off in 1st gear, it putters beautifully in 5th gear from 35-50, and the bike idles nicely from 55-70. The best part is that my gas mileage has gone up from the 60s to the 80s and sometimes over 90 mpg.

so far i cannot see any negatives for changing the sprocket and am amazed that the 30 tooth one does not come as original equipment.

any questions would be welcome
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post #2 of 15 Old 07-14-2009, 10:51 PM
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Welcome to the forum phdmam, I had the same thought, but if you use the search option and type in "30 tooth", I'm sure you'll find MANY postings on this.. Not trying to be a turd or anything, but I have also done this. I have also bought a 30 tooth sprocket and I love it too. And for anyone who hasn't yet, when you replace your chain, make sure it has 108 links or more... I got my new chain from e-bay the other day and finally had a chance to put it on today with the help of my girl.

Long story short, if I hadn't put the 30 tooth on, I would still be swearing, for my new chain only had 106 links. I had to pull the wheel all the way back with the old chain, and now I had to push it all the way forward, re-move the brake arm to the origional position, and completely re-align the rear wheel.. UGH!!!

Anyway, phdmam if you ever need anything, thats what we're here for and if all else fails and no one is getting back to ya, just use the search.

In between bikes right now.
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post #3 of 15 Old 07-15-2009, 12:53 AM
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I also wish that it was original equipment. I've done this mod too, and I love it!

However, when my sprockets and chain need changed I'll go for a 15T front and 33T back. Other riders that have done this mod report a little more power, but pretty much the same performance otherwise.

I can think of one negative. The original issue sprockets are 14T and 33T. An even tooth with an odd tooth. The reason thats done is so the chain links don't enter the same teeth every time around. With an odd/even combo the links eventually enter every tooth, the end result is that the chain wears more evenly.

With this mod you'll have to inspect your chain with a little more scrutiny so you can watch for wear patterns that are uneven.

Other than that, welcome to the forum! ruined this forum

bye, bye
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post #4 of 15 Old 07-15-2009, 05:32 AM Thread Starter
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thank you for your replies.

but where is the search function on this site?

thank you
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post #5 of 15 Old 07-15-2009, 09:13 AM
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Up at the top of the screen, the blue bar that goes from one end to the other. If you put your mouse pointer on the word a drop down menu opens up. Don't feel bad, I had a hard time finding it too! I think the trouble was that it was right in front of me.LOL ruined this forum

bye, bye
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post #6 of 15 Old 07-15-2009, 02:29 PM
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Welcome Phdman, you are on the best forum ever.

Keep the Shiny Side up
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post #7 of 15 Old 07-16-2009, 12:39 PM
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So is 15/30 out of the question?

Forgive my mechanical stupidity.
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post #8 of 15 Old 07-16-2009, 02:58 PM
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Originally Posted by rashley View Post
So is 15/30 out of the question?

Forgive my mechanical stupidity.
Not Stupidity, a very valid question.. I asked the same whe I was going to do this.. 15/30 wouldn't be good at all... in theory it would be a faster ratio, but truthfully with as little torque and power that the 250 cc engine has (17 hp max) even 14/30 is pushing it. On the highway I have trouble accelerating from 55-on through tip top speed.. It's a very comfy 55-70 with the 30 tooth on the highway, its just the acceleration part that suffers, also long uphill grades, things like that where you might have to downshift to get up some speed.

You could try the 15/33 and see if ya like that, or (if you can find em, I never tried) 15/32, 15/31.. I know you probably wont spend a whole lot of money on sprockets your not gonna use, but as for me, I am quite content with the 14/30. Thats my 2 cents, I hope this helps you.

In between bikes right now.
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post #9 of 15 Old 07-16-2009, 06:07 PM
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You could also look at it in terms of gear ratio.

14/33 = 2.357 (stock configuration)
15/33 = 2.2
14/30 = 2.143
15/30 = 2.0

The lower the gear ratio, the taller the gears become and the lower the engine RPM will be. However, the trade off of taller gears and lower RPMs is less torque to pull you up hills and against heavy winds. Thus, almost everyone would conclude that the 15/30 is simply too low of a gear ratio. From the above numbers you can see the similarity of the 14/30 and 15/33 configurations with the 15T front having the slight edge in torque.
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post #10 of 15 Old 07-17-2009, 08:22 PM
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Gearing with the sprockets

I have a 2002 Rebel, the 30 tooth sprocket is a good idea. I have made the change myself. FYI, if you try and go to the 15/30 ratio you will find out as I did. The 15 tooth front drive will not fit inside the case. So, as my mechanice suggested, if you are wanting to slow the motor down more additional reduction in the rear sprocket is suggested. But as one of the replies says, its hard on the bike in winds and up hills. I have spoke to my Honda mechanic and he suggests going no lower than 28 on the rear sprocket as the front sprocket is untouchable. There is one other suggestion when going to taller gears, leaning the fuel mixture slightly, as going to a taller gear will cause intermittent backfire through the carb. Apparently, going to a taller gear has a tendency to make the motor run somewhat rich. It will also increase your fuel mileage.
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