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Discussion Starter #1
I have decided that I would like the RPM's to be dropped slightly on the highway. From what I understand our bikes share many interchangeable parts with the cb300 line. I have ordered a 15t sprocket for the cb300 to install on the rebel. It should be here tomorrow and I will likely install it the same night! I will let everybody know how it goes. We have to get creative with the lack of aftermarket parts lol.
 

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Discussion Starter #3
Will do! Most people say that you must clearance the case saver slightly on the CB. I also don't know how the factory chain length will work. I'm at 600 miles and I hope that it has broken in a bit and there will be sufficient slack for the larger sprocket with some adjustments at the swing-arm.
 

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Discussion Starter #4
The CBR300 sprocket officially will fit and work on the Rebel 300! I did not clearance the case saver at all, it is a really tight fit but honestly its job is to touch the chain in the event of total chain failure anyway. (which is highly unlikely on a 300cc with a properly maintained chain.) I do not think during normal riding the chain touches it, so far there has been no abnormal noise. Also the factory chain fits around it with some slight adjustments done back at the swingarm. I believe my speeds are now 30/32 40/43 50/54 60/65 obviously there is some rounding up and down going on.

Also now the stock speedometer is off, I kinda forgot about that. Has anyone used a GPS to measure the accuracy of the stock speedometer in MPH?
 

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Discussion Starter #6
Well the question of stock accuracy dawned on me as I was putting the last bolts in the sprocket cover.....after changing to the new 15T sprocket lol. I have done the corrected speed calculation in 5 MPH incriminates from 20 to 70 MPH. I guess I will attempt to ride with my smart phone GPS speed app tonight and see if the numbers make sense!
 

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I've used DigiHUD before to get a reading on how fast my minibike was... lined up within a couple mph of the speedo on my brother's 4 wheeler.

If I remember, I'll open it up and check it against my truck on my way home today.
 

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Confirmed on the way home, DigiHUD is spot on with my truck, keeping in mind that there's lag during accel/decel due to the measurements being taken from satellites miles above, rather than a computer at the other end of a wire.

Sent from my SAMSUNG-SM-N920A using Tapatalk
 

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Discussion Starter #12 (Edited)
Thanks guys for checking! I too went home and busted out the GPS app, and somehow managed to hold my piece of paper with the corrected speeds and hold my phone while riding safely lol. But I came to the same conclusion, pretty much spot on!

I rode about 15 miles last night and I really like it. The main objective was to reduce highway cruising RPM (65 MPH is the fastest I go around here). Power feels roughly the same, but 60 is now 65 and the vibration is much better, my hands don't get as numb at all. I now would feel much more comfortable taking the bike on longer highway trips! Overall I'm pretty satisfied, and for a $20 sprocket I would recommend that anyone try it!

Now begins the journey of correcting the stock speedometer for my new gearing...

Also the speeds shown on my paper were rounded up and down at the first decimal place. Soooo they are ballpark but obviously not 100% accurate.
 

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If it's ABS the speedo takes its signal from the ABS wheel so it won't matter what sprockets you have, the speedo will auto correct. You only get ABS versions in UK. I'm going to assume that may not be the case elsewhere.
 

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If it's ABS the speedo takes its signal from the ABS wheel so it won't matter what sprockets you have, the speedo will auto correct. You only get ABS versions in UK. I'm going to assume that may not be the case elsewhere.
Uh, no? You can get the ABS anywhere. Not everyone get all the same colours with or without the ABS, and it being a 300 or 500, but you should still have the option just about anywhere to get one with ABS.
 

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Discussion Starter #18
Yes I was wondering if the ABS model gets its speedometer reading directly from the relutor wheel on the rear brake disk. But either way thats not gonna help fix the speedo on mine lol. I have been in contact with 12oclock labs and they think they have a speedo calibrator that will be plug and play for the rebel. I plan on trying it out shortly! I will let everyone know.
 

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I also used a gps speedometer on my android phone with a cell holder on my handlebars. I was only able to go up to 45mph but from 0 to 45 mph looks like the digital speedometer on the Rebel is very accurate.
 

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Hey Rutz1123,
Let us know how that calibrator works. I want to change the front and rear sprockets (once i can find a rear with less teeth) and will need to fix the speedometer somehow.
 
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