Downward
Guru
- Location
- West Midlands
Trek 1.5 comes in at about 10kg Jimbo and the 1.2 is heavier.
trek 1.2 double or triple
- Thread starter kingy_88
- Start date
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A 12 1/2 stone cyclist riding a 11 kg bike with some kit might total 92 kg total vehicle.
According to the CTC's 'PowerCalc'.xls, their 'Tourist' bike of 92kg total weight riding up a 10% gradient requires 299 Watts at a speed of 10kmh ( 6.25 mph ). I would agree with this.
Let's analyse this 12 ½ stone cyclist.
He's 175lb which is 79.5kg or 780 Newtons total.
His crank length is 0.17m so he can produce 132 Nm max ( without pulling up the backstroke ).
He pedals at 50 rpm, and using the 9459.3 constant, is generating 701 Watts peak.
Wow, that's over double what the CTC says he needs.
6.25 mph at 50 rpm is a 42" gear, which to the witchcraft is applicable to a 24lb bike ( 11kg ).
The rider is 79.5kg, the bike is 11kg, his kit is 1.5kg totalling 92kg.
Now I ask you, standing up on the pedal can get 700 Watts; and it needs 300 to climb a 10 % at 6.25 mph on a 42" gear, can YOU do that or not?
According to the CTC's 'PowerCalc'.xls, their 'Tourist' bike of 92kg total weight riding up a 10% gradient requires 299 Watts at a speed of 10kmh ( 6.25 mph ). I would agree with this.
Let's analyse this 12 ½ stone cyclist.
He's 175lb which is 79.5kg or 780 Newtons total.
His crank length is 0.17m so he can produce 132 Nm max ( without pulling up the backstroke ).
He pedals at 50 rpm, and using the 9459.3 constant, is generating 701 Watts peak.
Wow, that's over double what the CTC says he needs.
6.25 mph at 50 rpm is a 42" gear, which to the witchcraft is applicable to a 24lb bike ( 11kg ).
The rider is 79.5kg, the bike is 11kg, his kit is 1.5kg totalling 92kg.
Now I ask you, standing up on the pedal can get 700 Watts; and it needs 300 to climb a 10 % at 6.25 mph on a 42" gear, can YOU do that or not?
Look at it another way. Sit down and apply pressure on the pedal equivalent to a THIRD of your bodyweight and spin at 80 rpm.
This gives 380 Watts, which is plenty enough to get up that 10%.
In this scenario, you will be pedaling 80 rpm at 7.75 mph which is a 32" gear.
--- 30 x 25 ---
Well what do you know????
This gear happens to be the lowest on your bike, so what happens when you arrive at a 12% or a 14%, or even an 18% ?
Pedal slower.
This gives 380 Watts, which is plenty enough to get up that 10%.
In this scenario, you will be pedaling 80 rpm at 7.75 mph which is a 32" gear.
--- 30 x 25 ---
Well what do you know????
This gear happens to be the lowest on your bike, so what happens when you arrive at a 12% or a 14%, or even an 18% ?
Pedal slower.
Downward
Guru
- Location
- West Midlands
At 21 if your not totally unfit and lets face it at 21 even if you have been slobbing since 16 you should be than go for the 1.5 Compact.
