Try the very basics of bike fit first before spending money:
You want your knee to have a slight bend when at the bottom of the pedal stroke. The ball of your foot should be centred on the axle. When the cranks are horizontal you want the top of your shin bone (below the knee) to be directly above the pedal axle. Check both legs as they may be different enough... Seat should be close to level for most riders (and UCI racing rules...).
Easy way to do this, sit on the bike with the pedal at the bottom of the stroke, place your heal (in the shoes you ride in) on the pedal, feet horizontal. Move the seat up in height until your leg/knee is straight, do not rock your hips (reach), must be natural. Seat should be close to level. When riding the ball of your foot should be centred on the pedal, with your foot here you will now have a slight bend (damn close to perfectly correct) in the knee for the same pedal position. Do not ride with your arch on the pedal, I see too many people do this...
Next is front to back, the top front of the shin bone should be lined up (directly above) the forward pedal axle (with your ball of the foot above the axle of course) when the cranks are horizontal. Move the seat front to back to achieve this. Not everyone agrees with the necessity (importance) of this BTW.
To do the above either lean against a wall to hold your self up or have a friend hold up the bike. Try this, go for a some rides and see if it helps the butt pain.
The tough part of a new seat is wider and too soft "comfort" seats are not usually better, it is about fit but it can be hard to find the right fit looking at a display or web page... if you still need a new seat readjust height and front to back again. But try free adjustments first.
There is also a period of time required when new to riding or getting back on after a period off to build up butt endurance.
You want your knee to have a slight bend when at the bottom of the pedal stroke. The ball of your foot should be centred on the axle. When the cranks are horizontal you want the top of your shin bone (below the knee) to be directly above the pedal axle. Check both legs as they may be different enough... Seat should be close to level for most riders (and UCI racing rules...).
Easy way to do this, sit on the bike with the pedal at the bottom of the stroke, place your heal (in the shoes you ride in) on the pedal, feet horizontal. Move the seat up in height until your leg/knee is straight, do not rock your hips (reach), must be natural. Seat should be close to level. When riding the ball of your foot should be centred on the pedal, with your foot here you will now have a slight bend (damn close to perfectly correct) in the knee for the same pedal position. Do not ride with your arch on the pedal, I see too many people do this...
Next is front to back, the top front of the shin bone should be lined up (directly above) the forward pedal axle (with your ball of the foot above the axle of course) when the cranks are horizontal. Move the seat front to back to achieve this. Not everyone agrees with the necessity (importance) of this BTW.
To do the above either lean against a wall to hold your self up or have a friend hold up the bike. Try this, go for a some rides and see if it helps the butt pain.
The tough part of a new seat is wider and too soft "comfort" seats are not usually better, it is about fit but it can be hard to find the right fit looking at a display or web page... if you still need a new seat readjust height and front to back again. But try free adjustments first.
There is also a period of time required when new to riding or getting back on after a period off to build up butt endurance.
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