Belt drive fixed

My legs snigger everytime they see a 900cc motorbike engine.

Perhaps the motorcycle industry has missed something and has been using chains twice as heavy as bicycle chains for no reason.

Think of the weight saving when they start using kmc 510 chains on moto gp bikes!

However, the argument was that the carbon belt drive would stretch and the comparison between carbon belt drive and chain drive on similarly powered motorbikes still stands.
I was more saying you should be more worried about the belt stretching on your Trek than your motorbike but yes. Having said that, we are talking a very small amount of stretch, and nothing that will affect performance.

As for heaving chains on motorbikes, it's a good point and i'm trying to think why the use such heavy duty chains, maybe it just takes more stress than a bike chain? I.e a bike chain would stretch critically or fail within a couple of months of riding because you would do so many more K's.

double bollocks

Bollocks.

Physics, learn it.

Physics, learn it.

Making bold claims, citations. Use them.

Making bold claims, citations. Use them.

Google, use it.

Fuck him up Tommy!

You make a claim and offer no explanations or citation. That is not how science works. The make a claim and then say say google it method of argument is one used people claiming shit conspiracy theories.

yeah!

More power than my legs will ever have.

Common sense, apply it.

Google, use it.

More power than my legs will ever have.

Common sense, apply it.

pfffft

A gym, use it.

;)

not a fuck, i give it.

pfffft

A gym, use it.

;)

Repped.

You make a claim and offer no explanations or citation. That is not how science works. The make a claim and then say say google it method of argument is one used people claiming shit conspiracy theories.
True, but i'm right and your wrong so i couldn't care.
It was actually mentioned a few pages back that a bike chain has more force applied to it, hence my short original reply because it was already discussed and you know how people hate reposts.

More power than my legs will ever have.

Common sense, apply it.

Who needs common sense when i know the facts?

are you south african perchance?

I can play this game too!:

Motorcycle, ride it.

Yeah?

My legs snigger

Racist!

When I did a ramp test for some sport science students I peaked at 300watts. That translates to about 220lb/ft. (From what i've worked out that is.) The 300watts was over a period of time. Just think what the power output would be over a 10/20second sprint.

The Yamaha xt660 only produces 42lf/ft. Slight difference there

When I did a ramp test for some sport science students I peaked at 300watts. That translates to about 220lb/ft. (From what i've worked out that is.) The 300watts was over a period of time. Just think what the power output would be over a 10/20second sprint.

The Yamaha xt660 only produces 42lf/ft. Slight difference there

Well a very good climber can hit 800 watts, allegedly Boonen has hit 1200 watts hence the need for his custom bikes.
Cancellera broke his chain (physically snapped) while riding in the Dwars (was it?) that would take a fuck load of force alone, bike chains take for more force than a motorbike.

in 1st gear i think a motorbike chain must endure more force than a bicycle chain, for the life of me i cannot imagine it the other way round.
and another thing, why are bike chains considerably bigger ?

in 1st gear i think a motorbike chain must endure more force than a bicycle chain, for the life of me i cannot imagine it the other way round.

It's because a cyclist can develop a lot more torque than a motorbike engine.

Now considering that a Ducati 996 motorbike produces 93Nm at its maximum.
Now a 70kg cyclist standing on the cranks will be developing 9.8x70x(17/100) 116.62Nm

Because the sprockets they are applying this force to are almost equal radius (a 996 comes with 15 tooth sprocket as standard) it means the cyclist will be creating more chain tension.

so a motorbike chain is bigger for no reason ? it's doesn't compute

so a motorbike chain is bigger for no reason ? it's doesn't compute

Exactly my thinking.

Torque is only half the equation, the other half is RPM. On a bicycle we're talking around 100 RPM (YMMV) and on a motorcycle we're talking 3,500 > 5,500 RPM on some racing machines.

The chain has to deliver the torque at the RPM to give you power. That's where the issue is and why big chains on motorcycles are in use. Not because of higher torque, but because of higher RPM.

Delivering torque very slowly can be achieved with even lighter materials, it's when you apply the entire torque in an instant and need to do so continuously at high speeds that you need higher load bearing materials.

Bingo - the chain snap/slap that a motorycycle chain endures under hard acceleration is pretty insane too.