best bike for 100m sprint

[Get Karter]

You'd want the back wheel to be as underneath the rider as possible, to get most of the weight over it, to eliminate wheelspin at the start.

I, and I'm sure many here, am always doing that pulling away from lights.

So, I'd say, something like a track sprint bike with shortest possible chainstays (maybe a smaller rear wheel to accommodate this), and then suitably geared for the individual rider.

[mchammer89]

Do you often get wheelspin coming off the lights?

I've yet to get it in normal conditions and i'm a fairly quick rider.

[Get Karter]

mchammer89 said:

Do you often get wheelspin coming off the lights?

I've yet to get it in normal conditions and i'm a fairly quick rider.

If I put everything into it, and am out the saddle, hands in the drops (ie. weight forward), then yes, it happens frequently, usually once I have clipped in and am trying to accelerate as fast as possible from almost zero.. So I reckon someone going for a 100m sprint would be likely to spin up the rear wheel with the initial explosive input.

The selected gear is obviously a large factor in whether the rider's input will have the power to break traction.
When I have done it, I am probably in no longer a gear than about a 61 inch (42 x 18).

[AndrewM]

what like this? : http://www.youtube.com/watch?v=IS8MkdXP9O8

[paranoid airbag]

what a familiar video... I've never had wheelspin except in mud (either bike, don't ask what possessed me to find out how good road tyres were on mud, the answer is curiosity), occasional wheelies though, so clearly I'm more rearward.

[Sterls]

AndrewM said:

what like this? : http://www.youtube.com/watch?v=IS8MkdXP9O8

[Furberger]

Get Karter said:

You'd want the back wheel to be as underneath the rider as possible, to get most of the weight over it, to eliminate wheelspin at the start.

I, and I'm sure many here, am always doing that pulling away from lights.

There is no way you will spin a slick tyre on a dry road from a standing start.

[mchammer89]

Get Karter said:

mchammer89 said:

Do you often get wheelspin coming off the lights?

I've yet to get it in normal conditions and i'm a fairly quick rider.

If I put everything into it, and am out the saddle, hands in the drops (ie. weight forward), then yes, it happens frequently, usually once I have clipped in and am trying to accelerate as fast as possible from almost zero.. So I reckon someone going for a 100m sprint would be likely to spin up the rear wheel with the initial explosive input.

The selected gear is obviously a large factor in whether the rider's input will have the power to break traction.
When I have done it, I am probably in no longer a gear than about a 61 inch (42 x 18).

I've yet to do it on any bike of mine, I get the front wheel lifting up when i'm really going for it but I never get wheelspin.

[Get Karter]

mchammer89 said:

Get Karter said:

mchammer89 said:

Do you often get wheelspin coming off the lights?

I've yet to get it in normal conditions and i'm a fairly quick rider.

If I put everything into it, and am out the saddle, hands in the drops (ie. weight forward), then yes, it happens frequently, usually once I have clipped in and am trying to accelerate as fast as possible from almost zero.. So I reckon someone going for a 100m sprint would be likely to spin up the rear wheel with the initial explosive input.

The selected gear is obviously a large factor in whether the rider's input will have the power to break traction.
When I have done it, I am probably in no longer a gear than about a 61 inch (42 x 18).

I've yet to do it on any bike of mine, I get the front wheel lifting up when i'm really going for it but I never get wheelspin.

Well, I never get front wheel lift. I guess its a question of weight distribution.

ETA
Just think how tiny a contact patch there is on a properly inflated 23mm slick racing tyre. With weight forwards, a gear suitable for acceleration from a standstill, and an explosive push, you are likely to get a half turn of the cranks worth of wheelspin, especially if you have a half decent power to weight ratio. I guess heavy riders will be less likely to suffer wheelspin.

Edited by Get Karter on Monday 21st February 19:17

[mchammer89]

Get Karter said:

mchammer89 said:

Get Karter said:

mchammer89 said:

Do you often get wheelspin coming off the lights?

I've yet to get it in normal conditions and i'm a fairly quick rider.

If I put everything into it, and am out the saddle, hands in the drops (ie. weight forward), then yes, it happens frequently, usually once I have clipped in and am trying to accelerate as fast as possible from almost zero.. So I reckon someone going for a 100m sprint would be likely to spin up the rear wheel with the initial explosive input.

The selected gear is obviously a large factor in whether the rider's input will have the power to break traction.
When I have done it, I am probably in no longer a gear than about a 61 inch (42 x 18).

I've yet to do it on any bike of mine, I get the front wheel lifting up when i'm really going for it but I never get wheelspin.

Well, I never get front wheel lift. I guess its a question of weight distribution.

ETA
Just think how tiny a contact patch there is on a properly inflated 23mm slick racing tyre. With weight forwards, a gear suitable for acceleration from a standstill, and an explosive push, you are likely to get a half turn of the cranks worth of wheelspin, especially if you have a half decent power to weight ratio. I guess heavy riders will be less likely to suffer wheelspin.

Edited by Get Karter on Monday 21st February 19:17

Still no, i'm 70 kilos and the last time I was at Rollapaluza I set the fastest time there so I doubt it's a question of power/weight ratio. I think you just need a proper pair of tyres

[Get Karter]

mchammer89 said:

Still no, i'm 70 kilos and the last time I was at Rollapaluza I set the fastest time there so I doubt it's a question of power/weight ratio. I think you just need a proper pair of tyres

So your logic is, if something doesn't happen to you it can't happen.

Not the best basis for a rational discussion.

[Roman]

My guess:

Geometrywise it would look a bit like a swb 24" trials bike with low bars:

no saddle or seatpost
24" wheels & tyres (tubs not clinchers)
low mounted 'bullhorn' handle bars - linked by bracing tubes between the bar ends and each side of the front forks
single fixed 90"(ish) gear
1.5" headset
carbon or large diameter tubed frame & possibly carbon wheels

[mchammer89]

Get Karter said:

So your logic is, if something doesn't happen to you it can't happen.

Not the best basis for a rational discussion.

You sounded like you were suggest that it not happening was a result of a heavy rider or not having a decent power/weight ratio, I merely provided evidence that goes against it.

[OneDs]

Roman said:

My guess:

Geometrywise it would look a bit like a swb 24" trials bike with low bars:

no saddle or seatpost
24" wheels & tyres (tubs not clinchers)
low mounted 'bullhorn' handle bars - linked by bracing tubes between the bar ends and each side of the front forks
single fixed 90"(ish) gear
1.5" headset
carbon or large diameter tubed frame & possibly carbon wheels

+ Stick Jamie Staff on it, I always thought it was pointless putting him at the front of the team sprint when the other 2 (inc Chris Hoy) struggled to keep up for the first 300-400m, low 17sec for 500m from a standing start would equate to what over 100m?

Edit Sorry that was meant to say over 150m - 200m & low 17sec on 250m not 300-400 & 500m, got my track size fubared

Edited by OneDs on Tuesday 22 February 09:10

[Roman]

OneDs said:

+ Stick Jamie Staff on it, I always thought it was pointless putting him at the front of the team sprint when the other 2 (inc Chris Hoy) struggled to keep up for the first 300-400m, low 17sec for 500m from a standing start would equate to what over 100m?

Before he retired (to become the USA sprinting coach)on gearing optimised for 0-250m he was capable of standing start to 125 meters in 10.4 seconds according to Tissot so he should be capable of a Usain Bolt humbling sub 9 seconds 0-100m. Particularly on a purpose built bike with lower gears.

GB cycling are still missing him in my opinion, it's understandable that Jason Kenny would seek to chase Hoy's sprint crown rather than dedicate himself to training for the first leg of the team sprint as Staff did.

[JuniorD]

This is why I like PH so much, conclusive answers to hypothetical questions.

[Koing]

paranoid airbag said:

this is kinda the interesting point... i'll try and find the relevant link but apparently a sprinter reaches vmax at 40m, then decelerates gradually. My initial reaction against traditional track bikes is they'd still be accelerating at 100m, probably still 200m, as even a light 700c wheel will have a fair amount more inertia than a good 20" or 24" wheel. Track bikes generally seem to start very slowly (mainly gearing I guess, but disc wheels can't help). Guess I'll never get to see unless someone is stupid enough to create a 100m standing start sprint event though (damn)

Most sprinters hit vmax at 60m and then slow down.

On a fixed gear bike on a turbo trainer (yeah no wind resistance) on a gearing the same as Chris Hoy I did a 24.xxs 500m and a 1:28.35 1000m which I promptly felt TERRIBLE fro the lactic and throw up 25minutes later.

The saxo rider was rubbish. He's a endurance machine but he is not a sprinter. Any of the track guys would make mince meat of him.

Fixed gear all the way. The issue would be is the rider (held up) and clipped in or does he have to clip in himself?l

This is a fun idea guys

Koing

[mchammer89]

Koing said:

Most sprinters hit vmax at 60m and then slow down.

On a fixed gear bike on a turbo trainer (yeah no wind resistance) on a gearing the same as Chris Hoy I did a 24.xxs 500m and a 1:28.35 1000m which I promptly felt TERRIBLE fro the lactic and throw up 25minutes later.

The saxo rider was rubbish. He's a endurance machine but he is not a sprinter. Any of the track guys would make mince meat of him.

Fixed gear all the way. The issue would be is the rider (held up) and clipped in or does he have to clip in himself?l

This is a fun idea guys

Koing

Try Rollapaluza, it's a similar thing to the sprints you describe. Amazing fun!

[Koing]

mchammer89 said:

Try Rollapaluza, it's a similar thing to the sprints you describe. Amazing fun!

That's right up my street! Cheers!

Koing