Tyre Pressures

craigs23 · Mr Muscle Joined: 08 Jun 2005 Karma :

Little query here.

The New CB1's handling has been fantastic - tweaked suspension by a pro and new(ish) GPR100 tyres. I've been carving up corners with ease - just a slight feels-like-the-front-end's-going to wash (at peg scraping lean, 3mm or so from the edge of the front tyre) led me to check the pressures.

36psi rear, just under 20psi front!

I pumped the front tyre up to 33psi (around standard)

The front end's a lot sharper, turns from side to side with less input and smoother whilst doing so - also on pull aways.

However, the bike is less confidence inspiring, feeling too twitchy and not allowing me to use anywhere near the same lean/corner speeds...

Get used to it, or let some air out to a compromised pressure?

Was the wash-out feeling attributed to tyre wall flex?

beatnck · Could Be A Chat Bot Joined: 29 May 2006 Karma :

cant really help mate, but you give me some details on your suspension setup please? Embarassed

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craigs23 · Mr Muscle Joined: 08 Jun 2005 Karma :

The previous lady owner's boyfriend is a suspension speciallist. Needless to say, I think he must have been bored one weekend. The spec as quoted from the bike's advert:

Ariel Badger · Super Spammer Joined: 02 Dec 2006 Karma :

Shame that the expert never bothered to pump the tyre up, might have made more difference than all the other stuff Mr. Green

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craigs23 · Mr Muscle Joined: 08 Jun 2005 Karma :

I suspect the bike's been sitting for a while (or the previous lady owner didn't have access to such technological marvels such as a footpump).

Or maybe it was deliberately a low pressure....?

Ariel Badger · Super Spammer Joined: 02 Dec 2006 Karma :

Try checking for a slow puncture or air leak at rim or valve. They have a habit of turning into fast punctures.
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Barney · Spanner Monkey Joined: 17 Jun 2005 Karma :

SilvaRizla · Spanner Monkey Joined: 30 Apr 2006 Karma :

Checked mine 2 days ago and like yours they were well out. Have now experienced everything you descibe but have decided its just re-adjustment, you'll get more used to it and will be flying round the corners just as I now am. Stick with it, you will adjust to the responsiveness in no time Thumbs Up

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KTM Gordo · Brolly Dolly Joined: 19 Sep 2006 Karma :

The best place to go for tyre pressure information is the tyre manufacturer - see if they have a pressure chart of their web site, or ring their customer services number.

Bridgestone recommend higher pressures for my Fazer (36/40) than Yamaha do.

HTH Smile

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KTM Gordo · Brolly Dolly Joined: 19 Sep 2006 Karma :

A small change in tyre pressure can make a huge difference to the handling - as you've found out!

The best place to go for tyre pressure information is the tyre manufacturer - see if they have a pressure chart on their web site, or ring their customer services number.

Bridgestone recommend higher pressures for my Fazer (36/40) than Yamaha do.

HTH Smile

____________________
Change is inevitable - except from a vending machine.

KTM 990 Adventure | KTM EXC 250 Racing | Land Rover Freelander SE Td4

craigs23 · Mr Muscle Joined: 08 Jun 2005 Karma :

I'd pumped the tyre up to the rec. spec. in the manual - not sure if Dunlop would know what an NC27 is....

Need to wait til the weekend for a proper test at different levels - andto see whether the tyre's actually deflating on its own accord...

SilvaRizla · Spanner Monkey Joined: 30 Apr 2006 Karma :

When did you last put air in it? (If never how long have you had it?)
____________________
I'm Ivan Dobski the Meatsafe Murderer only I never done it, I only said that I done it so they'd take the truncheon out of my bottom

MarkyPancake · Crazy Courier Joined: 05 Jul 2005 Karma :

When I got my 2004 R1 the dealer fitted a new OEM rear tyre (Dunlop D218) and both front and rear were inflated to the maximum 42psi so the first thing I did was check on Dunlop's web site and they recommended 36psi for both on my year and model bike and that's how I've kept them.

craigs23 · Mr Muscle Joined: 08 Jun 2005 Karma :

The 25psi I let the front down to felt pretty good on the way home...