TT250 rear sprocket, etc fun

mtiberio · 09-25-2016, 05:22 PM

So I'm experimenting on gearing for my TT250. Stock 50 tooth rear is too short, and I'd like to maximize highway speed with minimal revs. I purchased a JTR269-49 and a JTR269-47, I also purchased from PBI in Aluminum, a 3041-46 and a 3041-48. Together, I now have from 46 through 50 to choose from. I first tried the 47. Great reduction in revs at top speed, but I felt like top speed was compromised. Now trying a 48, and haven't had a chance to do any extended top end runs. Will report later...

A couple of things. Given the offset in the stock sprocket, and the fact that all my alternative sprockets are flat. I was thinking, why not stack two sprockets with appropriate spacers, to give you multiple choices in rear gearing with nothing more than a axle loosen and chain adjust? Leave both sprockets mounted, and just move the chain side to side. Either sprocket would be no more off centerline that my current flat ones are relative to the stock offset. Just a thought. Currently I have run the 50, 48 and 47, and haven't shortened my chain. Once I decide on gearing I'll get a quality o-ring chain of the right length. Still I might have a dual rear sprocket setup in the future...

Lastly, not chain or gearing related, but I noticed that one of the rear brake hoses holder clamps was secured by the caliper retention bolt. Since I haven't figure out how to remove the rear wheel without pulling the caliper from the caliper hanger, I wanted to remove the clamp to simplify bolt tightening. When I did this, the bolt stuck through, and rubbed the disc at its high spot. Solved with a washer, but a word to the wise...

09-25-2016, 05:22 PM	#1
mtiberio Join Date: Jun 2016 Location: Arlington, VA Posts: 258	TT250 rear sprocket, etc fun So I'm experimenting on gearing for my TT250. Stock 50 tooth rear is too short, and I'd like to maximize highway speed with minimal revs. I purchased a JTR269-49 and a JTR269-47, I also purchased from PBI in Aluminum, a 3041-46 and a 3041-48. Together, I now have from 46 through 50 to choose from. I first tried the 47. Great reduction in revs at top speed, but I felt like top speed was compromised. Now trying a 48, and haven't had a chance to do any extended top end runs. Will report later... A couple of things. Given the offset in the stock sprocket, and the fact that all my alternative sprockets are flat. I was thinking, why not stack two sprockets with appropriate spacers, to give you multiple choices in rear gearing with nothing more than a axle loosen and chain adjust? Leave both sprockets mounted, and just move the chain side to side. Either sprocket would be no more off centerline that my current flat ones are relative to the stock offset. Just a thought. Currently I have run the 50, 48 and 47, and haven't shortened my chain. Once I decide on gearing I'll get a quality o-ring chain of the right length. Still I might have a dual rear sprocket setup in the future... Lastly, not chain or gearing related, but I noticed that one of the rear brake hoses holder clamps was secured by the caliper retention bolt. Since I haven't figure out how to remove the rear wheel without pulling the caliper from the caliper hanger, I wanted to remove the clamp to simplify bolt tightening. When I did this, the bolt stuck through, and rubbed the disc at its high spot. Solved with a washer, but a word to the wise...
	0