â Seat angle comparison: 71 degree vs. 74 degree (slack vs. steep) â Vertical seat height: The 71-degree seat angle places the seat almost one-half inch lower. I found that I could not turn faster than about 60 rpm in any gear (I normally turn ⦠A steep seat tube angle allows racers (and anyone else who wants to ride fast) to achieve a ⦠It can handle a dropper post with internal routing, so one can have that option with a 10-speed ⦠Donât be intimidated by the metric system or the math. We are not exactly talking about 73 degree versus 74 degree here, but rather a more dramatic shift forward of the body, more like ⦠I went from a 74 degree back to a common 73, and lost 10 minutes on a ride. Other factors are at play here. 71mm of bottom bracket drop. Likewise, 74 degrees offered more efficiency than 68 degrees. This study is interesting because it tests not only three different seat angles (68, 74, and 80 degrees⦠72mm rake of fork rake. A very general bicycle fitting rule (to optimise pedalling efficiency) is to have your knee reach the pedal axle (see diagram). Seat tube angles are most often in the range of 72 - 74 degrees on modern bicycles. When it comes to smashing your stuff, a millimeter is as good as a mile. 74 degree seat tube angle. 34mm of trail with a wheel flop of 10mm. Weight: 1708 Grams. Head Tube: Integrated 1-1/8â³ TNT PRO-XL FRAME . Weight: 1729 Grams. One or two degrees angle will amount to didly swat. All that means is, if you draw two 21.6-inch lines from the same point in space, ⦠Seat Tube Angle Comparison for 57cm Bikes: Touring bikes 71-73 degrees Road bikes 73 degrees CX 73 degrees. Seat Tube Angle: 71 Degree. A 74 STA is on the steeper side for a road bike (any steeper any you're looking at tri or TT bikes). Maybe in 1000 miles you will have a whole new perspective on this issue. I have a suggestion, since you are an advocate of steep seat angle, why not keep using that forward post. On a bike, the difference between a 72-degree seat tube angle and a 74-degree one doesnât sound like much. Note that the seat angle is virtual if the seat tube is raised, so our tester with a slammed seat will never see this angle. I run a 75 degree seat tube on a triple chainring HT with no operational problems. 72 degree head tube angle. I have long legs, and I'd need to slide my saddle as far backwards as possible on a seat post with setback to make a bike with that angle seat tube fit me. Seat tube angles have zero to do with how well or how poorly a bike climbs. If you were to slacken a seat tube angle, your knee may not reach as far as the pedal ⦠The seat tube angle is the included angle between the seat tube and the top tube (assuming that the top tube is level, or the angle between the rear of the seat tube and the ground plane. Thatâs significant. Geometry is standard fare, with a 64-degree head angle and 74-degree seat tube angle. Seat Tube Angle: 72 Degree. TT Length: 20.75â³ Chainstay Length: 14.5-15.75â³ Head Tube Angle: 74 Degree. All frames have 1in head tube extension built in. Most of Specialized's Tarmac frames have seat tube angles from 73° to 74°, although the very small 44cm model has an unusually steep seat tube angle of 76° which moves the saddle closer to the handlebar for less of a stretch. But for every 1-degree difference and 55cm traveled, the fore-aft difference is 1cm. I went out and rode my temporary frame and discovered that the difference of one degree on the seat tube angle makes all the difference in the world. Head Tube: Integrated 1-1/8â³ TNT PRO FRAME . The extra upward tilt of the rear section of the derailleur will amount to about 1mm. The article stated that, "At a seat tube angle of 80 degrees, mean VO2 was significantly lower and power efficiency significantly higher compared with an angle of 74 degrees." Chain stays are 44cm from the center of the bb to the center of the rear axle. 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