Wets - pressures.....
 

Hi

Having just bought a set of wets I realise I have no idea what pressures they should be run at.....! - anyone know...

Pirelli Rain 180 rear

Thanks

Set temperature to 75 degrees C for 1 hour, then set pressures to

Rain Tyres - 2.3bar (33psi) front and 2.1bar (30psi) rear

That is what I was told to use a few years ago now mind bit there were on Pirelli wets new type not the block pattern ones.
Glyn

Don't use warmers with wets. It overheats them.
Run 34-36psi cold. Higher pressures are better as it keeps the tread separated.

Nige that is contrary to What pirelli say about their tyres.
Not doubting your way though
glyn

Thanks guys

Glyn - so what do pirelli say......

Wets shouldn't be heated to over 50c..........I was told

confused - you will be............;-)

But not contrary to Metzeler or Dunlop. As a matter of interest I was struggling with my wets a bit last year at Pembrey...I couldn't get the bike to turn. Alan Russell of A&R Racing came to me, put more air in my tyres and turned my warmers off. I went back out in the ****ing rain...got my knee down, turned the bike without trouble and delivered my best wet race result ever. On Pirellis. :lol:

Believe me...warmers are bad news on wets. If you don't have enough air in the tyres and they are too warm them the tread will fold and squirm, the tyre will deform and you will find it hard to turn the bike because the tyre is not maintaining shape. The difference that I felt was a revelation.

Bang on!!

LOL I was told by pirelli Exactly what I posted.. But then again if you read the other thread regarding rosso tyres pirelli are not exactly correct with their statements. Saying that tho I ran my 998 Race bike with the above details at caddy in the wet and had no problems lifting the front whilst still cranked over exiting mansfield, Scared me..... YES it did
If it worked for you nige then great, I know a lot of guys run em from cold and let the tyres come to you, Rather than using warmers and having loads of grip on the first 2 corners then binning it on the third because they have gone cold.
Horses for courses.
Glyn

9 times out of 10 warmers in the wet are pointless, by the time they are off and you have got to the track the tyres are cold anyway..well so im told by most riders..

Yup they are so pointless The Gp and wsb boys use em.......BSB use them and they are on pirelli rubber too,
But as I said earlier Horses for courses.
This is the info I had from Pirelli, Who as it goes Own Metzeler..

These are a starting point - you may prefer slightly higher or even slightly lower pressure depending on track temperature, riding style, suspension settings etc.

Tyre warmers - if you are going to use them, buy a good quality warmer with thermostatic control.
We recommend you use warmers for rain tyres as well as "drys".

Set temperature to 75 degrees C for 1 hour, then set pressures to:

Racetec's - 2.2bar (32psi) front and 2bar (29psi) rear
Rain Tyres - 2.3bar (33psi) front and 2.1bar (30psi) rear (I would recommend K1 compound front and rear for Rain tyres) - Only use rain tyres when there is standing water on the circuit. A drying line will destroy the tyres very quickly.

Tyre warmers aren't critical for either tyre, but you will get better performance throughout the life of the tyre if you do use them.

Regards,

Jim Worland
Product Manager
Metzeler Moto UK

Thanks again for all the advice

Didn't realise it would create so much discussion!!

I won't be using warmers as I have the diamond ones without the thermostatic control so I think they're set to 90c - which is too hot I think

I've got a K1 & K2 BTW

I think the best thing will be to take both sets of pressures and experiment......he says diplomatically....;-D

Cheers

Chris

I know they do, and if your as good as they are then fair play... ;)


Sorry I was referring to most mortals that are not lined up on the grid....



Or I guess if you are a mortal with warmers on and you have an off at least you wont be able to blame tyre temp...:)

Why would mere mortals Need wets, You dont need them for a trip down the local cafe to swoon over your mates bikes, If your going on track to race or purely for enjoyment its all about "Getting it right"
My point wasnt that Im a racing god, But that if Pirelli who design the tyre and go through the R&D to giving specific spec for optimum use of their product.
Why wouldnt you use them ???? is it because You know better than the manufacturer or you think you do???

Chef
You can still use your warmers with their tyres, There is a formula for your very type of warmers, Reducing the time with a higher heat, My notes are at work tho so i would have to find them tomorow.

I'd always listen to your advice and take it..! And I agree with you, I'm just posting with my own ability in mind...small! I think its very important to follow what the manufactures recommendations are. But for most, like me, by the time you've removed warmers, waited 15-20 mins to get queued up, run out to the track the tyres are back to where they were when they came out the van..just as wet and just as cold..
Please don't think I'm disagreeing with you in any way, I'm always out to learn more and take on board what someone like you is offering.. technology changes each day and nothing more so than with tyres..:)

No Worries Arthur.
;)

Hi Glyn

Speaking as some one with the ability of a turnip I agree with you on the 'getting it right' philosophy

Be great if you could let me have the formula or timings for the diamond warmer

I'm at Brands on the 23 March so next week would be superb if you can.....

Cheers

Chris

A little bit more info for you from Metzeler regarding higher than 75C set warmers like Daimond ones at 90C.

with 90C warmers,Simply reduce time to 45-50 mins, Replace the tyre warmers after every session to reduce Heat cycles ( Max 40 Mins)


That is all I have matey. Have fun at Brands.
Glyn

Thanks Glyn that's perfect....

With respect Chris by the time your done fannying around getting out on track, let alone the wet and cold weathers actions................you might as well not bothered with the tyre warmers in the first place!

let alone keeping the heat in them............:rolleyes:

Ahhhh another tactful comment from the queen of diplomacy.....

With respect.....f**k off....:-D

am i wrong then?...............some people only want to hear what they want to hear........would you rather i lied to you?

Andy - I was joking - hint is in the :-D face

Are you having a bad day....

Hada row with your wife.....or has she still got that headache she's had for the past 6 months.....;-D

past 6 months......weve been together longer than that......:devil:

I haven't used tha latest generation of wets as most of my racing done on wets was between 1998 and 2003. so the newer style wets that around now I can't really pass comment on. But I can try asking my mate Russ who won a few wet SoT races in Superclub last year to see what worked for him.

If I had known about the question proio to seeing John and Rick Hackett yesterday I could have asked them for advice on the subject

On those older wets that I used I never used warmers and ran them 2psi higher than I did my dry tyres so 33Fr/32Rr for the wets and 31Fr/30Rr for the dry race tyres.

you're not alone - it's called being married I'm told...:-O

The headaches get worse with children.......

Thanks Kev