Dong Fang DF 250 RTB Bobber Information

[barnone]

Aboshi,
Funny you should ask about sprockets because I just changed out the rear and went with the 33 tooth below. Had to remove three links from the 520 chain but kept the stock 13 front tooth because I decided to not modify the front sprocket cover.

Front Sprocket JTF270.14 14 tooth
Rear Sprocket JTR279.33 33 tooth
They are the ones you gave me in post 185. I got mine from Old Bike Barn but anyone that handles JT sprockets should be able to get them. Rear fit just fine but you need a big pair of o-ring pliers or fight it like I did with a couple of screw drivers.

33/13 = 2.53 my current ratio
45/13 = 3.46 stock DF
38/13 = 2.92
41/15 = 2.73 Heist stock

I only had time for a short ride but it sure was nice to be able to get up to 20 MPH indicated in first gear. It might be too high a ratio but I'm going to try it for a while and report my finding later. Your ratio of 13/38 might be better.

Actually the seat is pretty nice. I adjusted the preload to the max on the spring under the seat to get me sitting up straight with my new bars. The sheep skin or a leather cover like you suggested will help.

EDIT: Stock DF rear sprocket is 45 teeth not 40.!!!!!!!!!