PR: Proprietary Items Tyre wear

[Howard]

I like to keep you old folks active, so here's a question.

I usually have unworn tread on the edge of the tyres on my Egli (chicken strips), it doesn't need to lean any further. When I take it on the track it's a different matter and the rear tyre gets scuffed to the edge, but the front has chicken strips. Last weekend's track day was the opposite for some reason, front scrubbed to the edge, rear with plenty still to go.

Tyres are both 90 profile - 100/90 x18 front and 90/90 x18 rear.

I'm not losing sleep over it, just interested in the comments - why?

Howard

 

[vibrac]

"Chicken strips" WTF?
You meet some good phrases on here after over half a century there is always something to learn! a picture please I would like to understand

 

[Mr. Boring]

Had to look it up myself.

 

[davidd]

Howard,

It depends a lot on the tire pair. I have had this happen when I use a front rim that is a little too wide. Tires like Dunlops are sensitive to rim width, particularly in the low profile sizes. I used WM3 rims front and rear on my racer. If the front tire is on a rim, like a WM3, it is widened out a bit and when you hit the edge of the tire, if you could magically look at the back it is not near the edge, because it happens to have the proper contour for a WM3. In my case, the front tire really wanted a WM2 rim. In that case they would have both reached the edges of the tire at the same time.

However, the Avon tires are more round shouldered, in general. When switched to Avons, it was much harder to see exactly where the tread ended and the mismatched size of the front rim did not seem as apparent.

You need a modern bike to get "fried chicken" strips.

David

 

[Cyborg]

The older you get, the wider they get......

Deep fried = TZ750?

 

[Cyborg]

If you are running the same wheels and tires, did you make any changes to the suspension setup? Eat a big meal before the second outing?

 

[Howard]

I thought maybe a tyre pressure problem, but I'm running the same pressures I've always done on modern Avons. I think I may have been using Roadrunners last time I did a trackday, that may make a difference. Photos attached for Tim.

 

[vibrac]

Ah! Thankyou I see what you mean
remember I am only just off of triangular tyres.....

 

[passenger0_0]

When I take it on the track it's a different matter and the rear tyre gets scuffed to the edge, but the front has chicken strips. Last weekend's track day was the opposite for some reason, front scrubbed to the edge, rear with plenty still to go.

I'm not losing sleep over it, just interested in the comments - why?

Howard

Could it be due to you using a different riding style between the road and the track?

On the road we tend to ride more conservatively and progressively lean into the corner. On the track we know the surface well and can ride more aggressively, turning in the handle bars on corners and causing more wear on the front tyre. Essentially the front tyre works harder when racing compared to road riding.

This difference in riding style is demonstrated by the rear tyre often needing replacement at twice the rate of the front while road riding. On the track however the front often wears at the same rate as the rear.

Having said all of this, of course if you have a really powerful bike then the rear will be spinning up more on the track and will completely disprove my point!

 

[Howard]

I love track days, they throw up all sorts of questions you never thought of, and would never be asked just road riding. I spent 2 weeks riding the Egli to Spain in the 70s, 2 up with full camping gear, 80 mph plus motorway travelling and over the Pyrenees without a problem. 2 weeks later I took it to VOC Cadwell, and the chain guard fell off in the first practice session.