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Trail can vary as the bike leans or steers. In the case of traditional geometry, trail decreases (and wheelbase increases if measuring distance between ground contact points and not hubs) as the bike leans and steers in the direction of the lean. [17] Trail can also vary as the suspension activates, in response to braking for example.
So, for example, if a route is 20 kilometres (12 mi) with 1600 metres of climb (as is the case on leg 1 of the Bob Graham Round, Keswick to Threlkeld), the equivalent flat distance of this route is 20+(1.6×8)=32.8 kilometres (20.4 mi). Assuming an individual can maintain a speed on the flat of 5 km/h, the route will take 6 hours and 34 minutes.
Q factor is a function of both the bottom bracket width (axle length) and the cranks. Bottom brackets axles vary in length from 102mm to 127mm. Mountain bike cranks are typically about 20mm wider than road cranks. [6] A larger Q factor (wider tread) will mean less cornering clearance (while pedaling) for the same bottom bracket height and crank ...
A more-sophisticated model that allows a wheel to steer, adjust the path, and counter the torque of gravity, is necessary to capture the self-stability observed in real bikes. For example, a bike in a 10 m (33 ft) radius steady-state turn at 10 m/s (36 km/h, 22 mph) must be at an angle of 45.6°.
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For example, assuming no wind, one gets the following results for power delivered to the pedals (watts): 175 W for a 90 kg bike + rider to go 9 m/s (32 km/h or 20 mph) on the flat (76% of effort to overcome aerodynamic drag), or 2.6 m/s (9.4 km/h or 5.8 mph) on a 7% grade (2.1% of effort to overcome aerodynamic drag).
Mountain bicycle gearing is often very wide-ranging, from very low ratios to mid ratios, typically with 9 to 28 gears, although some riders prefer the mechanical simplicity and ease of maintenance of single-speed mountain bikes. 29ers are mountain bikes that are built to use 700C or ISO 622 mm wheels. 27.5 bikes are mountain bikes that are ...
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