Saw tooth tyre wear pattern

[Ventodue]

I thought trail braking tended to have that effect on tires.

Dunno about that ... (I'm not a great trail braker). But looking on Tinternet, I did find some info that made sense:

What factors influence saw-tooth tyre wear?



• Tread pattern: the greater the spacing between the tread blocks, the more the risk of saw-tooth wear occurring
• Mixture hardness: soft tyres are more susceptible to saw-tooth wear
• Tyre pressure: overpressure increases the risk of saw-tooth wear
• Suspension: worn or damaged suspension increases the risk of saw-tooth wear
• Driving style: abrupt acceleration and braking will increase saw-tooth wear on non-driven wheels.

How/why does it happen?



1. As the tyre rolls along the road, the tyre blocks deform as they come into contact with the road surface.
2. When in contact with the road, they’re both deformed and compressed.
3. As they lose road contact and de-compress, they “rub” the surface while snapping back into their original shape.

The result is higher wear on the block run-out edge. It is more likely to occur on non-powered wheels.

Sources:
http://www.oponeo.co.uk/tyre-article/sa ... -tyre-wear
http://www.evanshalshaw.com/Files/pdf/c ... s_2010.pdf

[LaceyDucati]

Always brake into corners myself, my principle has always been if you are not braking or accelerating then you are not in control!

Nigel

[machten]

Brilliant work Craig! That explains a few things to me and I suspect I can tick a few of those boxes you list.

Graeme, I had a look at the Dunlops, but they don't appear to have the 2.75 x 18 that I need for the M3D.

Nigel, I'd happily try a Heidenau, but after looking around, they seem pretty hard to come by in this neck of the woods. Shame, as I like the look of them.

Has anyone tried the Metzeler ME22? Not exactly a classic pattern to my mind, but I'm not sure I care and options seem somewhat limited.

http://www.metzeler.com.au/shop/category/commuter

Kev

[Ventodue]

Always brake into corners myself, my principle has always been if you are not braking or accelerating then you are not in control!

(Well yes, in that sense, I 'trail brake' too, Nigel . Apologies - I was being slack. I meant I don't 'brake to the apex'. I'm a Keith Code* graduate, you see ... )

Any thoughts on remery's original idea, tho'? Looking at the principles in those articles I posted, I s'pose it could make sense that saw toothing is caused/exacerbated by braking while the tyre is leant over ...?

Craig

* I quote:
"The first thing you need to realize is that you should always be ‘trailing off’ the brakes. Leant over or straight up, your brake release is that moment where your entry speed is set. So any abrupt release is going to be less accurate and usually slower than a well executed, tapered, gradual release."

[machten]

(Well yes, in that sense, I 'trail brake' too, Nigel . Apologies - I was being slack. I meant I don't 'brake to the apex'. I'm a Keith Code* graduate, you see ... )

Gee, Craig...your brake light switch must have failed in the French Alps. Didn't see it come on too often when I was trying to catch ya.

Kev

[Ventodue]

Gee, Craig...your brake light switch must have failed in the French Alps. Didn't see it come on too often when I was trying to catch ya.

Ah well - we can't afford too much of that braking stuff when riding the singles, can we, Kev? . The Laverda, on t'other hand - well, let's just say I'm glad Massimo fitted twin floaters up front . And NO comments about 'agricultural equipment', please!

(Plus of course the fact that an unmodified front brake on a SCR is a pile of pants anyways ... )