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View Full Version : Tyre treads: how much is functional, how much is art?


Onan the Clumsy
17th Mar 2005, 18:33
and why are the knobbly bits sometimes slightly different sizes, like someone hand carved the original mold?


:zzz:

airship
17th Mar 2005, 19:13
I don't know. Maybe the original moulds are cut by hand?!

But why don't they cut advertising slogans in treads? :8 I suppose they would have to be cut backwards in order to be read correctly. BMW drivers could fit spray cans:

E
N
A
L

Y
L
N
O

W
M
B

:E

Jerricho
17th Mar 2005, 19:16
This could be a very tyring thread.

Onan the Clumsy
17th Mar 2005, 19:21
Yes. You'd better tread carefully.

Jerricho
17th Mar 2005, 19:23
I really miss Carnsie sometimes :(

PilotsPal
17th Mar 2005, 19:26
Yes, he could really keep the pressure up in here.

Jerricho
17th Mar 2005, 19:27
Rather than re-treading over old ground?

Onan the Clumsy
17th Mar 2005, 19:28
Jerricho, please stop inflating the number of responses

PilotsPal
17th Mar 2005, 19:29
I can see this t'read going round and round for days.

airship
17th Mar 2005, 19:29
The Mods won't mind. Radials have an aviation connotation.

Onan the Clumsy
17th Mar 2005, 19:35
Yes, I think the mods will spare it

B Fraser
17th Mar 2005, 19:38
The writing's on the wall .... and they'll have 2 Bar it :yuk:

i know...... hat......coat.......door

airship
17th Mar 2005, 19:39
You mentioned knobbly bits being differently sized. I must have a high-tech knobbly bit because it's size is variable...

Oooops, on a slippery slope here...

chuks
17th Mar 2005, 19:47
The reason for the funny shape changes in the tread blocks, from large to small and back again, is to minimise the noise generated. If the blocks were all one size then the tires would make a loud whining noise at a certain speed.

Then the ratio of the blocks to the voids is worked out to give a good compromise between tread wear and clearing water beneath the tire.

A lot of modern tires have a directional tread pattern which helps to 'pump' the water from beneath the tire in rainy weather.

Nowadays they use a lot of silica in the rubber mix to give good wet grip. One notices this particularly with motorcycle tires, compared to those of 20 years ago, say.

If you are using road tires on a track you may notice 'graining', when the rubber overheats and begins to peel away in little shreds. Also, you may see a blue sheen that means some of the chemical elements in the rubber mix have started to cook out. The tire's grip will not be as good as new, even if the tread is not badly worn.

airship
17th Mar 2005, 19:55
I did say we were on a slippery slope...chuks is being serious :(

Nereus
17th Mar 2005, 19:58
not serious, just a flat spot in the thread

reynoldsno1
17th Mar 2005, 20:03
this could make ply very cross

airship
17th Mar 2005, 20:03
Therefore the valleys in the treads should be wider towards the outer edges in order to reduce spray then. Welshmen could test for adequate depth in these regions.

FLCH
17th Mar 2005, 21:19
I was thinking about putting my toe in ...but I'll pass on this current thread...

airship
17th Mar 2005, 21:21
Christians are reborn.
Buddhists come back as ants.
Tyres come back as remoulds.

Onan the Clumsy
17th Mar 2005, 21:24
Buddhists come back as ants I'll have to tell that to my uncle.

airship
17th Mar 2005, 21:29
But only if Uncle's been naughty. Otherwise he stands a good chance coming back as a butterfly or maybe caterpillar. They got treads...

PilotsPal
17th Mar 2005, 21:58
I have to admit the standard of posting on this one has left me feeling all deflated. Some of you definitely need your egos puncturing.

airship
17th Mar 2005, 22:01
I'm sorry to disappoint you PP. It's not been a very good year for me so far either.

PilotsPal
17th Mar 2005, 22:04
Oh dear airship. 20p in the machine will soon have you all firm again.

airship
17th Mar 2005, 22:18
Well I suppose a Durex could be considered as a form of inner tube.

Nereus
17th Mar 2005, 22:21
would that be a durex with tread or bald?

airship
17th Mar 2005, 22:31
Ribbed pattern I believe. Is that the most suitable under the conditions?

The SSK
17th Mar 2005, 22:37
Tyres as art (http://www.fineart.ac.uk/works/cn_048/cn_048a_large.html)

Nereus
17th Mar 2005, 22:39
you'd hope so in wet conditions, need to be low profile too

PilotsPal
17th Mar 2005, 22:41
I'm sure Kwikfit will be able to help you out with a speedy fitting service.

B Fraser
17th Mar 2005, 22:54
Is this thread going Continental ?

C'mon chaps, let's keep it slick :}

Nereus
17th Mar 2005, 22:56
continental........... would that be the 69 profile?

redsnail
17th Mar 2005, 23:06
hey, it could be Goodyear then? :D

PilotsPal
17th Mar 2005, 23:07
Just keep the Michelin man away from me!

airship
17th Mar 2005, 23:08
This t'read is open to everyone. If someone from Yokohama wants to contribute, please feel welcome.

PilotsPal
17th Mar 2005, 23:20
Whatever happened to Bicycle Repair Man?

seacue
18th Mar 2005, 01:24
I thought part of the reason for the silica was because of antipolution pressure to reduce the carbon black in tires.

Unfortunately high percentage of silica increases the electrical resistance of the tire and increases the static electricity. This can result in increased radio noise in the MW band ... as I found when I replaced the tires on my previous car.

While off-topic concering slipery slopes - I contend that this post is boring enough to compensate.

FLCH
18th Mar 2005, 03:29
"Whatever happened to Bicycle Repair Man?" I believe the poor man had a flat tyre..........hence he is not here

toothpic
18th Mar 2005, 06:47
Airship,
Would you use a hard or soft compound? Or maybe an intermediate in case the track starts to get a bit damp?
Maybe with the ribbed version you would have to use the full wet weather set to prevent a nasty skid!

B Fraser
18th Mar 2005, 07:30
"Whatever happened to Bicycle Repair Man?"

I think is local patch is Avon :}

lasernigel
18th Mar 2005, 07:53
I've been tracking this tread and found it rather groovy.Wonder who will tyre out first?:ok:

Terraplaneblues
18th Mar 2005, 09:13
I've Dunlopeing around and decided to squeel on you lot.
I could get angry and fire stones, but you might put this post in the Schrader if I Presta point.
Americans never tire of disc cussing this subject, but I wouldn't condome it.
Having said that I'm off to India....:p

The Invisible Cat
18th Mar 2005, 09:37
One's quite surprised no one mentioned the Pirelli calendar yet
:rolleyes:

The SSK
18th Mar 2005, 10:43
Somebody called?

http://sammy.hippy.jp/sketch/pic/p_bicycle_repair_man.jpg


Why, hes mending it with his own hands!

See how he uses a spanner to tighten that nut!

Oh, oh, Bicycle Repair Man, how can I ever repay you?

Clink! Screw! Bend! Inflate! Alter Saddle!

PilotsPal
18th Mar 2005, 11:09
The Pirelli calendar. Wonderful examples of non-artificial inflation.

B Fraser
18th Mar 2005, 12:01
Blimey, look at the wheel-nuts on that one :E

airship
18th Mar 2005, 12:49
Cor! Look at the grooves on that one.

Onan the Clumsy
18th Mar 2005, 12:52
nuts? :confused:

Are you a young lady?

lexxity
18th Mar 2005, 12:56
The Pirelli calendar. Wonderful examples of non-artificial inflation.


I would have thought it was all compressed air?

coat...yoink...door..slam....byee

airship
18th Mar 2005, 13:03
I'm 76kg for 1.78m. So I don't carry a spare tyre. If I wore red and made vroom-vroom noises I'd probably get some admiring glances...

Jerricho
18th Mar 2005, 16:10
......and have a straight-jacket slapped on you real quick.

Volmet South
18th Mar 2005, 17:47
wheel-nuts

Onan,

as in "Scammel Wheel Nuts"

see also..... chapel hat pegs.... fighter pilot's thumbs..... smuggling peanuts.... rasberry ripples

:E

Firestorm
18th Mar 2005, 18:56
Onan: you seem to getting a good ribbing on this subject! But you're taking like a Trojan! ;)

Mac the Knife
18th Mar 2005, 19:07
For heavens sakes guys - get a grip!

HI O WISE PRINCE. WHT TOOK U SO DAM LONG?

Ripline
18th Mar 2005, 20:35
Anyone else here thinking of re-tyring?


where did you say the way out was?

Ripline

FLCH
18th Mar 2005, 21:24
One shouldn't re-tyre until one has worn shoulders and a bald spot....

Nereus
18th Mar 2005, 21:38
after re-tyring for a short while, there's nothing to stop you from rolling on though

Jerricho
18th Mar 2005, 22:26
Christ, is this thing still going round and round?

Onan the Clumsy
18th Mar 2005, 22:27
Yeah. I get pumped up just reading it.

redsnail
18th Mar 2005, 22:32
But the pressure is getting a bit much. :D

Firestorm
19th Mar 2005, 11:47
Seem to have hit a bit of a flat spot......

SyllogismCheck
19th Mar 2005, 12:14
The t'read wear indicator is showing now and the comments have become radial.
The whole things getting uni-directional, isn't it time to remould it into something new before we're down to the wire?
It's beginning to make me 'cross, ply' me with something 'good, rich' and gripping before it wears me out completely.

Good year you say? Wranglers! You're all torquing nuts! Spare me!

Lon More
19th Mar 2005, 13:17
This tread should be dis-banded

Onan the Clumsy
19th Mar 2005, 13:19
Hey look this thread's got four pages, plus an extra one in case we need it.

Avtrician
20th Mar 2005, 00:30
Wait 12 mths, and some one will retread it.

(Helmet , Bike I'm off)

FLCH
21st Mar 2005, 00:37
Just waiting for this tread to run flat.............

SyllogismCheck
21st Mar 2005, 00:39
If it does, use this.... it's a space saver. :ugh:

simon brown
21st Mar 2005, 14:46
The reason for the funny shape changes in the tread blocks, from large to small and back again, is to minimise the noise generated. If the blocks were all one size then the tires would make a loud whining noise at a certain speed.

as opposed to the wife making a loud whining noise when you go too fast;)

Onan the Clumsy
22nd Mar 2005, 15:41
Not really - he's just biased

airship
22nd Mar 2005, 15:57
I'm feeling down, yeh man. Many rivers to cross. Can I have a Bridgestone please? Troubled waters they be...