Gearing Picker
Pick your bike and a track and see proven sprocket combos. Example: a Yamaha R6 at NJMP Thunderbolt runs well on 16 front / 43 rear.
Default ≈ 22" for this bike at mid-adjuster.
Tip: going up on the rear or down on the front lengthens the required chain. A common rule — +3 teeth on the rear (or −1 front) usually adds 2 pitches. Always verify with the adjusters before cutting; aluminum rear sprocket wear, new vs used chain, and tire size all shift the final fitment by a link.
Proven track setups for Yamaha YZF-R6 (06-20)
Drives off the carousel and onto the front straight without hitting the limiter in 6th.
Shorter tighter layout — drop a tooth front for harder acceleration out of T1 and the bowl.
+2 rear from stock to drive uphill out of Oak Tree.
Stock-ish; long front straight needs the taller setup.
Tight, rhythm track — shorter gearing keeps it on the cam through the museum complex.
Stock works; don't overgear or you'll bog out of T11.
Short shifty layout; −1 front helps the climb to the Corkscrew.
Twisty rhythm circuit — shorter gearing pays off everywhere.
Tall gearing for the banking — most riders go −2 rear from stock.
Verify before you buy
MotoBuildIQ provides general performance suggestions only. Race class rules change every season — always confirm current legality with your organization's rulebook. Horsepower, pricing, and fitment vary by bike, fuel, dyno, and tuner.