Shorter cranks are easy to spin (smaller circles), BUT starts need lower gears and shorter legs. I have thought about maxxis holy-rollers in 24 and fairly thin width, however i have a pair of k-rads and quiver to think of the minimal grip i would get in a bmx race with that type. they seem to feel a little grippier at the lower pressure. Longer cranks get better starts and power and turn slightly harder gearings, BUT it's harder to spin for a long time. Both of mine currently start off at round that 90psi range, and slowly fall to round 45-55psi range. Street and flatland BMX bikes have a low gear ratio of 25/8 (25 teeth on the chain wheel 8 teeth on the rear sprocket). Remember to consider what crank length they are running with those gearings, too. On a 20" bike, I run a 45/16 gear setup which is similar to my 24"er.Ī little BMXer (like a 7-year old) may try several gear-inches lower, but check around the other kids' bikes and get an average. Gear Ratios & Inch Gears When participating in BMX racing or is simply a bike enthusiast, it is important to know the ways of changing the gear ratio and at its destined time On the other hand the powerglide 1st gear is pretty comparable to 1st-over in the 6 speed setup which is a pretty sweet set of ratios each just 22 apart on upshift and 28. I run about a 54 to 57 inch gear on my cruiser (17 in back and 40 in front, usually), with 180mm cranks, depending on the track but I run 17/40 most everywhere.
#BMX RACE GEAR RATIO SERIES#
The BILLET BMX RACE TEAM JERSEY Series is our top-of-the-line, feature-loaded racing gear. Gearing plays a significant role in race and training performance and its every track cyclists goal to try and pick the optimum gear to match their. We recommend keeping name under 12 digits long but we can go up to 20 digits max. You can fine tune the gearing after you get the first straight gearing settled. Gear Ratio Chart/Rollout Chart 20 x 1-1/8 Wheels (with 20 x 1 tires, 19.375 inflated diameter) 20 x 1-1/8 Wheels (with 1-3/8 tires, 20.5 inflated diameter). Custom Name Tip: The longer the name the smaller the font. If it seems that your starts are great, but you spin out by the first jump, then you need to go up a tooth in front.īasically gauge how you feel on the current gearing now, and use the charts as just a reference point for adjusting either way.Īlso, it depends how long the track is. Try going one tooth lower in front, unless your gearing is waaay hard then you could try either going up 1 tooth in back or down 2 to 3 teeth in front.Ĭhanging 1 tooth in back is about the same as changing 2-1/2 teeth in front.
Pickle's BMX Bicycle Racing Gear Ratio Chartsīasically, if you are getting bad starts AND aren't spinning the gear out 3/4 way down the first straight, then the gearing is too hard.
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