tyre deflection

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zoidberg · #1 Post by **zoidberg** » Sun Jul 27, 2014 8:56 am

Erm. Is this normal to be running that far over?

https://www.dropbox.com/s/qui54t4o4geez ... .20.07.jpg

Dalemac · #2 Post by **Dalemac** » Sun Jul 27, 2014 9:01 am

Probably not.

What are the tyre pressures like?

zoidberg · #3 Post by **zoidberg** » Sun Jul 27, 2014 9:06 am

I haven't checked since the garage fit them. They asked what bike so i assumed they were right.

Dalemac · #4 Post by **Dalemac** » Sun Jul 27, 2014 9:19 am

How long was that? Tyre pressure should be checked once a week.

The less air in the tyre, the more contact patch it has with the ground, and the easier it will be to deform the tyre and go into the sidewall.

Sidewalls are not designed to be in contact with the ground. The rubber there is very, very thin.

zoidberg · #5 Post by **zoidberg** » Sun Jul 27, 2014 9:25 am

About a week, I'll get em checked. Perhaps I should have put a 190 on there

blinkey501 · #6 Post by **blinkey501** » Sun Jul 27, 2014 10:35 am

zoidberg wrote:About a week, I'll get em checked. Perhaps I should have put a 190 on there

Correct tyre pressures are 36/42

flatlander · #7 Post by **flatlander** » Sun Jul 27, 2014 11:16 am

I think that try pressure has been mentioned before ;) and that the garage will put (if they bother) what the manufacturer says but that most run different pressures. I run 36 and it suits me. That said I have run it nearly flat after it has been stood DOH!

I think Blinkey sometimes runs a lot more but that is when he is transporting another bike in bits on the back :)

#8 Post by **mangocrazy** » Sun Jul 27, 2014 11:47 am

Presumably that's a 180/55 on the standard 6" rim? Unless the tyre pressures are way, way off, I don't believe that mark was caused by tyre deflection. Far mor likely to be something rubbing in that area.

Having said that, something still looks wrong about that picture. There is no change of angle (or very little) from the tread to the side wall. There should be more than a 90 degree angle between tyre tread and sidewall, but yours seem closer to 180 degrees in that pic. Could you take a photo from a different angle?

MartDude · #9 Post by **MartDude** » Sun Jul 27, 2014 12:36 pm

If it were caused by deflection, I'd expect to see the 'Rosso II' lettering more worn. As Graham said, it's more likely that something is rubbing there.

zoidberg · #10 Post by **zoidberg** » Sun Jul 27, 2014 1:24 pm

It's the same bot sides and those tyres have done about 30miles that's why the lettering is still prominent

blinkey501 · #11 Post by **blinkey501** » Sun Jul 27, 2014 2:09 pm

zoidberg wrote:It's the same bot sides and those tyres have done about 30miles that's why the lettering is still prominent

What size rear tyre is that? 190/55?

squadron Nero · #12 Post by **squadron Nero** » Sun Jul 27, 2014 2:43 pm

The line looks like it has too clean of an edge for it to be deflection. I'd check for something rubbing, might only occur while the suspension is under load so maybe get someone to sit on it while you check. If you can't find anything. I'd take it back to your supplier and ask questions / reject it if you can as a defective unit.

zoidberg · #13 Post by **zoidberg** » Sun Jul 27, 2014 4:12 pm

blinkey501 wrote:
zoidberg wrote:It's the same bot sides and those tyres have done about 30miles that's why the lettering is still prominent
What size rear tyre is that? 190/55?

It's the standard falco size 180/55

I'll check pressure and maybe email pirelli a pic if it's an issue

D-Rider · #14 Post by **D-Rider** » Mon Jul 28, 2014 10:51 am

I'm with the "something rubbing" opinion - particularly as there seems to have been no real wear towards the edge of the tread.

zoidberg · #15 Post by **zoidberg** » Mon Jul 28, 2014 10:58 am

I haven't checked the pressures, but I went through the garage on the way out this morning and nothing is rubbing anywhere. the tyres are scrubbed in all the way to the edge and haven't got any real wear as they haven't been very far.