A control device includes an electronic controller that controls a motor of a human-powered vehicle. The electronic controller outputs a signal to change a transmission ratio by operating a linking body with a derailleur while driving the linking body with the motor where a first condition related to pedaling is satisfied. The first condition relates to at least one of a pedal state, a human driving force input to the pedal, a crank arm state, a human driving force input to the crank arm, a crank axle angular acceleration, a rotational state of a first rotational body, a tire state, a rotational state of a second rotational body, an operational state of the linking body, an operational state of the derailleur, a rotational state of the motor, an electric energy supplied to the motor, a handlebar state, a saddle state, and positional information of the human-powered vehicle.

In a drive unit attached to a vehicle-body frame of an electric-motor-assisted bicycle including a one-way clutch including an outer member, an inner member, a plurality of clutch lugs, a plurality of springs, and a plurality of pins. Clutch teeth are located on one of an inner peripheral portion of the outer member and an outer peripheral portion of the inner member. The clutch lugs and the springs are located on the other of the inner peripheral portion and the outer peripheral portion. A number of the clutch lugs is an even number not smaller than four. A number of the clutch teeth is an even number that is not a multiple of the number of the clutch lugs. A number of the springs is half the number of clutch lugs. Each spring exerts a biasing force on two of the clutch lugs that are circumferentially adjacent. Each pin is in contact with one of the springs.

A rear suspension system for bicycles, such as freeride, downhill and trail-style mountain bikes. The suspension system includes a rear suspension for coupling the rear wheel of the bicycle to the bicycle frame, a rear shock absorber disposed entirely in front of the seat tube of the frame and a linkage for operatively coupling the rear suspension to the rear shock absorber. The linkage intersects the longitudinal axis of the seat tube for transmitting rear suspension forces around the seat tube to the rear shock absorber. The seat tube is preferably continuous and is disposed so that the bicycle seat is adjustable over a full range of seat positions. Additionally, the seat tube and rear suspension system are configured so that the rear wheel and rear suspension will not contact the seat tube, seat, or bicycle rider even when the rear suspension system is in a fully compressed, forward position.

A rear suspension system for bicycles, such as freeride, downhill and trail-style mountain bikes. The suspension system includes a rear suspension for coupling the rear wheel of the bicycle to the bicycle frame, a rear shock absorber disposed entirely in front of the seat tube of the frame and a linkage for operatively coupling the rear suspension to the rear shock absorber. The linkage intersects the longitudinal axis of the seat tube for transmitting rear suspension forces around the seat tube to the rear shock absorber. The seat tube is preferably continuous and is disposed so that the bicycle seat is adjustable over a full range of seat positions. Additionally, the seat tube and rear suspension system are configured so that the rear wheel and rear suspension will not contact the seat tube, seat, or bicycle rider even when the rear suspension system is in a fully compressed, forward position.

A rear suspension system for bicycles, such as freeride, downhill and trail-style mountain bikes. The suspension system includes a rear suspension for coupling the rear wheel of the bicycle to the bicycle frame, a rear shock absorber disposed entirely in front of the seat tube of the frame and a linkage for operatively coupling the rear suspension to the rear shock absorber. The linkage intersects the longitudinal axis of the seat tube for transmitting rear suspension forces around the seat tube to the rear shock absorber. The seat tube is preferably continuous and is disposed so that the bicycle seat is adjustable over a full range of seat positions. Additionally, the seat tube and rear suspension system are configured so that the rear wheel and rear suspension will not contact the seat tube, seat, or bicycle rider even when the rear suspension system is in a fully compressed, forward position.

A rear suspension system for bicycles, such as freeride, downhill and trail-style mountain bikes. The suspension system includes a rear suspension for coupling the rear wheel of the bicycle to the bicycle frame, a rear shock absorber disposed entirely in front of the seat tube of the frame and a linkage for operatively coupling the rear suspension to the rear shock absorber. The linkage intersects the longitudinal axis of the seat tube for transmitting rear suspension forces around the seat tube to the rear shock absorber. The seat tube is preferably continuous and is disposed so that the bicycle seat is adjustable over a full range of seat positions. Additionally, the seat tube and rear suspension system are configured so that the rear wheel and rear suspension will not contact the seat tube, seat, or bicycle rider even when the rear suspension system is in a fully compressed, forward position.

A drive unit reliably and stably attached to a bracket, even if the bracket has high stiffness, includes a housing including first and second suspension bosses located between first and second side plates of the bracket in a left-right direction of a bicycle. A first bolt is fastened to the first suspension boss and inserted from an outside in the left-right direction of the bicycle into a hole in the first side plate. A cylindrical member is fitted into an insertion hole in the second suspension boss that is open toward the second side plate. The cylindrical member is slidable in the left-right direction of the bicycle and includes a thread groove located on an inner periphery thereof engaging a thread located on an outer periphery of a second bolt that is inserted from the outside in the left-right direction of the bicycle into a hole in the second side plate.

An electric-motor-assisted bicycle includes a vehicle-body frame and a drive unit including two couplers. The vehicle-body frame includes a bracket and a pair of chain stays. The drive unit is attached to the bracket. Each of the chain stays is attached to a position on the bracket rearward of a crank axle in the front/rear direction of the bicycle. One coupler is forward of the crank axle in the front/rear direction of the bicycle. The other coupler is rearward of the crank axle in the front/rear direction of the bicycle. At least one of a region of the bracket to which the chain stay is attached and a region of the bracket to which the other coupler is attached does not overlap a line segment connecting a shaft center of the axle of the rear wheel to a shaft center of the crank axle.

A bicycle includes a chainstay protector having an upper surface including a valley, a first peak, and a second peak. The first peak extends upwardly from the valley toward the chain and has a first contact surface positioned to contact the chain a first height above the valley. The second peak extends upwardly from the valley toward the chain and has a second contact surface positioned to contact the chain a second height above the valley. The first contact surface is spaced from the second contact surface by a gap that is at least 5 times the first height. Each of the first and second contact surfaces has a length that is less than the length of the gap and less than two times a pitch of the chain.

A bicycle includes a chainstay protector having an upper surface including a valley, a first peak, and a second peak. The first peak extends upwardly from the valley toward the chain and has a first contact surface positioned to contact the chain a first height above the valley. The second peak extends upwardly from the valley toward the chain and has a second contact surface positioned to contact the chain a second height above the valley. The first contact surface is spaced from the second contact surface by a gap that is at least 5 times the first height. Each of the first and second contact surfaces has a length that is less than the length of the gap and less than two times a pitch of the chain.