Was thinking about adding a 13T front sprocket to KLX 250s. I would like to get some more low end grunt, but still need highway speeds. What kind of top speed can I expect from changing the front sprocket to a 13T? I Have no plans on changing the rear sprocket. How much will this modification change my speedo? Also, wanted to know what the RPM range will be also? (13/42T)

 

When you get that one figured out, let me know.....

 

Just wanted to get a ball park range? I don't want to get blown away on the highway by Prius.

 

if the top speed on a stock klx250s is 75 mph...you'll get blown away by a prius on the highway....if you are reducing your front sprocket, you'll reduce your highend even more...so, you'll get blown away by a 250 scooter on the highway...

 

When I had my 13 tooth on I actually could get to and maintain highway speeds better but it was around 500+ rpms higher at any given speed. I now run the 15 tooth to lower rpms since I mostly commute at the moment. Its a little harder to maintain speed if there is a head wind though unless i tuck for aerodynamics

 

i noticed same...front sprocket change is about 500 to 600 rpm +/-....and, if 1 size in front is equal to 3 in back sprocket....going up or down 3 sprockets on rear is about 500 to 600 rpm +/-

 

What is peak RPMs on the bikes?

 

it's not on your bike?..i think it's 10,500 rpm...

 

What is the best maximum shift point on the bike? 8500 RPMs?

 

if you saw dynobob's dyno graph, you should see it's at 7,500 to 8,000 rpm...