I just cannot understand how what I think of as a “perfect” riding position is significantly more than 100mm longer/larger than your suggested RAD. The 2017 Trek Top Fuel is a M/L with a reach of 443 and head tube angle of 70° and the 2018 fully-rigid Heller Bloodhound (with 27.5×3” wheels) has a reach of 423 and hta of 68.5°. Both bikes have a RAD of 795 on the nose. I just went and measured my 2 current bikes that I have what I consider to be pretty dialed in after years of riding (mostly gnarly old-school XC stuff - no flow no gravity as much technical uphill climbing as possible). I can’t figure out how it could be possible though… I’m a pretty average medium-sized guy (5’7” without inflation), so using your calculators, I should be on a bike with a reach of around 362 and a RAD of between 644 and 659. Reach. Change the stem length or use a handlebar with different setback.Ī friend just sent a video where you discuss your RAD concept (we’ve been talking a lot about sizing, since we are both buying new bikes soon). You can adjust your bike’s RAD in a few ways: When it comes to RAD, a bit too short is much better than a bit too long. Some downhill and freestyle riders, who need more range of motion than peak sprint power, have RADs that are “too short.” This is common among tall riders. When bike RAD is too short, you reduce torque and increase control (to a point). I’ve set up about 1,000 riders, and 95% of their bikes had too much RAD. When bike RAD is too long, you reduce torque and reduce control. You climb technical trails easier and shred technical downhills harder. When you get to the last 10mm, then the last 5mm, then to perfect, something clicks. As your bike RAD gets closer to ideal for you, your bike will start to feel better. We can of course ride a wide range of bike setups (we’ve been doing it for years). Q: How close to perfect does RAD have to be? Bikes have gotten longer but people haven’t. Warning: These multipliers will give you shorter RADs than you typically find on fashionable bikes. My bikes are within a few millimeters of this number. If you’re female, multiply your height in centimeters by 4.60Īt 174 cm tall I get a RAD of 778mm. If you’re male, multiply your height in centimeters by 4.47 While these recommendations are not gospel, they are good starting points for most people. Use a simple multiplier. The multipliers below assume average proportions, sweet spot handlebar width, height-appropriate crank length, and average pedal and shoe thickness. When you shop for a new bike, try to match that number.Ģ. If you love your current bike, measure its RAD. Dialed: The secret math of the perfect mountain bike setup.ġ.
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