New touring tyre tests – good early showing by Schwalbe

[bretonbikes]

Not all "rough" surfaces are "bumpy".

Many roads in Ireland are constructed with a top dressing of loose clippings rolled into the Tarmac. This is not terribly bumpy but is very rough and on occasion I have lost speed on shallow downhills. Under these conditions my ill informed guess is that lower pressure would considerably increase resistance.

I'm not implying that lower pressure will roll better, but that the optimal pressure will be lower than for a smooth surface. e.g. on track 'boards' (or rollers as it the rolling road drag tests above) you want the tyres as high as they will possibly go and that as the surface becomes rougher the best pressure falls - at some point on every surface there will be a crossover where the extra tyre flexing causes more drag than the tiny ups-and-downs and jiggling of the harder tyre - I'd guess that the rougher the surface the lower this optimal pressure is.

But it's only a guess...

[yostumpy]

well, all this talk of tyres and especially the Schwalbe Spicer, I bought 2........soon to be another 2 for the other bike. Do I like them ....? Yes. providing they stay ''visitation' proof.

https://yacf.co.uk/forum/index.php?topic=94471.0

Here they are.

[bretonbikes]

well, all this talk of tyres and especially the Schwalbe Spicer, I bought 2........soon to be another 2 for the other bike. Do I like them ....? Yes. providing they stay ''visitation' proof.

https://yacf.co.uk/forum/index.php?topic=94471.0

Here they are.

I see one of the people answering you claimed that he'd found my article on tread patterns http://www.bretonbikes.com/homepage/cyc ... ycle-tyres and that 'the writer' (me) had confused "makes the mistake of thinking tyre pressure on the road depends on the load (rather than the inflation pressure of the tyre)" - I'd appreciate it if you pointed out that he should read the artcle again where he sees I refer to the pressure of the tyre ON the road, not the pressure inside the tyre - it's found by dividing the contact area into the load:-) - yes the contact area varies with pressure too but there's a limit on how complicated I wanted to make a simple point ...

I'll register on the forum (is it any good?) to bend his ear myself;-)

[mjr]

I'll register on the forum (is it any good?) to bend his ear myself;-)

No, it's awful. It doesn't allow people who can't pass an eye test or a hearing test to register themselves.

[bretonbikes]

I'll register on the forum (is it any good?) to bend his ear myself;-)

No, it's awful. It doesn't allow people who can't pass an eye test or a hearing test to register themselves.

(edit) - Sorry I thought this was a joke on my comment about bending someone's ear... Not a good situation.

[yostumpy]

I'll register on the forum (is it any good?) to bend his ear myself;-)

No, it's awful. It doesn't allow people who can't pass an eye test or a hearing test to register themselves.

put it this way... its as good as this site. people everywhere are like marmite

[mjr]

put it this way... its as good as this site. people everywhere are like marmite

No, it really isn't. This site doesn't block some disabled users like that. That's just sick, if not illegal.

[Samuel D]

This site doesn't block some disabled users like that. That's just sick, if not illegal.

It’s ignorance or laziness by the forum software developers. It doesn’t say much about the forum itself, which is interesting but so heavily (and pointlessly) divided into sub-forums that I only ever catch about half the posts that would interest me.

This CTC forum suffers from pointless sub-division too, but to a much lesser extent.

[bretonbikes]

This site doesn't block some disabled users like that. That's just sick, if not illegal.

It’s ignorance or laziness by the forum software developers. It doesn’t say much about the forum itself, which is interesting but so heavily (and pointlessly) divided into sub-forums that I only ever catch about half the posts that would interest me.

This CTC forum suffers from pointless sub-division too, but to a much lesser extent.

Wow - I thought it was a joke - but now I see what you mean.

[al_yrpal]

If you bookmark "Board Index / View active topics" you wont miss a thing?

Al