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Discussion Starter · #1 ·
So I was trying to install a 15T front sprocket on my 2011 450 and I found that it will definitely not fit without modifications.

Any other way to make it fit without griding the part of the frame that sticks out to hold the chain slider from moving?

Also will there be clearance issues with the chain? You can't see from the picture but it looks like it would be a really tight fit.

 

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Discussion Starter · #3 ·
I want the lowest possible gearing for a road track that I plan to race on.

14-40 won't cut it, so I might need to look for a 37 rear, which amost no one makes.

I was hitting readline at 97 mph about half way down the straight yesterday running 14-43.
 

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grind the tips off of the counter shaft sprocket teeth --
from the picture it looks like you would have to take off a lot --
 

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I hear you.

I'd just grind that little tab off and call it done. Just make sure you don't ruin your case in the process.

Grinding the sprocket teeth it's self is just retroactive and not very safe for you and your bike.
 

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Discussion Starter · #7 ·
i hade to modifications that tab on my 04 . i went 15/39 and i love it
How is your chain wearing? Any stretch? How about the chain slider?

I just ordered a 38T JT sprocket. Now with 14-38 I'm thinking that may just ruin the chain and slider.
 

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I'm run-in 13 44 on the street and keep debating goin up to a 14 or 15 do you think it would be I'm practical? Like would first be to tall for constant stop starts if I get in any traffic? I have a crf450x with jetkit pipe gutted airbus and such.
 

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I run a 15/43 on the street, 6k RPM in 5th is ~60mph and it has plenty of down low, first is a bit iffy, but that's what the clutch is for.
 

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I would expect to have to cut that tab off, as well as cut out clearance on the chain slider. I also removed the case saver, spaced the drive sprocket farther out, and flipped it over so the extended face is facing toward the bike. Without this, the chain can hit the rounded edge where the clutch actuation lever mounts. My '05 can fit a 15 and a 16, but I run 16-39 pretty much everywhere. Top speed is in the 120 range, although it sometimes requires a draft to get there. Sprocket specialists can make smaller rear sprockets. They made as small as a 36 for me. But, with 16-36, the chain rubs the top of the swingarm pretty much all the time. I wore through a chain slider in a day with the 36 rear, and it was messing with the suspension performance. 15-37 would be more of the same, since the drive sprocket is also smaller.

Excuse the dirty parts. This is a 16 on an '05 450R. This shot was post race documentation of the chain slider and chain wear.
 

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Discussion Starter · #12 ·
Forgot to check this for a while. Thanks for the picture Stephen.

I think I will try to avoid the mess with fitting a 15 front. I tried 14-38 a few weekends ago and it wore the chain slider significantly.

This weekend I will try 14-40...it may be a good compromise for some of the two straights at Cayuga, topping out at about 106 mph.
 
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