Quote:
Originally Posted by paulsstag
@ Brap , not 100% sure yet . It did show 60 mph on the speedo with more to go with the stock gearing but 1st not sure how accurate the speedo is? and 2nd with the stock gearing the rpms sounded really high to my ear ? ( no tach ). Just went out for a nice ride today with the 17 tooth front vs the 15 tooth stock and now at an indicated 50mph the bike sounds and feels great. Also i have reconsidered changing the rear sprocket at this time as i went on some very narrow and rough trails and found first gear about perfect ( the goldilocks state  ) and realised if i went smaller on the rear i feel first would be too tall for this kind of riding. |
That sounds about right. Your bike with a 15f/46r sprocket setup and a 110/90-17 tire has the same effective gearing as our Hawks 15/50 with its 110/100-18 tire. With the 17 tooth front you have the same gearing as the Bashan Brozz and a factory equivalent gearing as a TT250 (17/50 with the 18" tire).
With that gearing, you are sitting right at 7000rpm at 60mph.
With the stock 15 front and 46 rear you are at 7900rpm at 60mph.
Top speed should be right around 62ish mph, give or take. You could drop a tooth or two out back and still keep a lot of that first gear crawling ability. I know many TT250 owners drop down to a 49 or 48 tooth rear on their bikes.