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Author Topic: major swerve on front wheel with new tyre  (Read 430 times)

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Offline Maya the Bee

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major swerve on front wheel with new tyre
« on: March 21, 2020, 06:56:27 pm »
Hi there,
New Pirelli MT60 was fitted today on my 2007 GS650.
But now I've sit with a scary problem...anything over 130km/h and the front wheel start to swerve allot  :-\
What could be the problem here? Issue with the tyre or maybe something else?
This did not happen with the original tyres, can't remember now what it was...think it was a Bridgestone something...
To put into context - I bought the bike in December last year, with ONLY 500km on the clock. So the OEM tyres was still "new", but 12 yrs old, hence me replacing it today.
Bike now has 1159km on clock
Currently: 2020 Suzuki GS150R; 2016 BMW GS700; 2007 BMW GS650
Previously: 1988 Honda MBX 50; 1990 Yamaha XS 1.1; 2003 Honda Africa Twin 750; 2007 GS1200; 2008 GS1200; 2011 GS1200; 2018 Kawasaki Ninja 400, 2019 Kawasaki Ninja 650, 2019 Honda NC750X
 

Offline LouisXander

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Re: major swerve on front wheel with new tyre
« Reply #1 on: March 21, 2020, 07:07:34 pm »
Too hard?
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Offline 2StrokeDan

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Re: major swerve on front wheel with new tyre
« Reply #2 on: March 21, 2020, 07:48:55 pm »
Have you ever had it up to 130 on the old tyres? No swerving?
 

Offline Maya the Bee

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Re: major swerve on front wheel with new tyre
« Reply #3 on: March 21, 2020, 07:52:12 pm »
jy mag dalk reg wees...hulle het dit 2.5 voor en 2.7 agter gepomp
ek dink meer dit moet in die omgewing van 2.1 voor en 2.3 agter wees
sal dit more verander en gaan toets
Currently: 2020 Suzuki GS150R; 2016 BMW GS700; 2007 BMW GS650
Previously: 1988 Honda MBX 50; 1990 Yamaha XS 1.1; 2003 Honda Africa Twin 750; 2007 GS1200; 2008 GS1200; 2011 GS1200; 2018 Kawasaki Ninja 400, 2019 Kawasaki Ninja 650, 2019 Honda NC750X
 

Offline Maya the Bee

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Re: major swerve on front wheel with new tyre
« Reply #4 on: March 21, 2020, 07:53:53 pm »
yes, had it well passed 130 on the old tyre and it was stable
Currently: 2020 Suzuki GS150R; 2016 BMW GS700; 2007 BMW GS650
Previously: 1988 Honda MBX 50; 1990 Yamaha XS 1.1; 2003 Honda Africa Twin 750; 2007 GS1200; 2008 GS1200; 2011 GS1200; 2018 Kawasaki Ninja 400, 2019 Kawasaki Ninja 650, 2019 Honda NC750X
 

Offline Oubones

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Re: major swerve on front wheel with new tyre
« Reply #5 on: March 21, 2020, 08:03:50 pm »
Check that is completely on the bead!
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Offline LouisXander

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Re: major swerve on front wheel with new tyre
« Reply #6 on: March 21, 2020, 08:49:57 pm »
En kyk maar dat alles mooi vas is?
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Offline Sprocketbek

Re: major swerve on front wheel with new tyre
« Reply #7 on: March 21, 2020, 09:54:33 pm »
Jirre, lewe jy nog  :imaposer:

Remember that new tires are super slippery for the first few km, take it easy on cornering and after you have done all your turning then tell us if there still is a problem.
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Offline 2StrokeDan

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Re: major swerve on front wheel with new tyre
« Reply #8 on: March 21, 2020, 10:19:27 pm »
En kyk maar dat alles mooi vas is?

I am not sure how clamping works on those front wheel axles, but check that everything is tight.
 

Offline Tommy Transalp

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Re: major swerve on front wheel with new tyre
« Reply #9 on: March 22, 2020, 06:13:50 am »
Has the tyre been put on the correct way, rotation -wise?
I run my Transalp at 2bar front and back...
A 650  doesn't need the higher pressures that 1200's require.
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Offline 73 Peanut

Re: major swerve on front wheel with new tyre
« Reply #10 on: March 22, 2020, 06:44:09 am »
Front 2 bar and rear 2.3 max on such a light bike and then it's still pretty hard . The 650 can run at 140 all day long and it doesn't move around . Check that front wheel that the shaft is tight and lower the preassure .
 

Offline BuRP

Re: major swerve on front wheel with new tyre
« Reply #11 on: March 22, 2020, 09:17:45 am »
anything over 130km/h and the front wheel start to ....

A bittoohard tyre does not really do this, but an unbalanced one does - check?
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Offline LouisXander

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Re: major swerve on front wheel with new tyre
« Reply #12 on: March 22, 2020, 09:27:36 am »
Nope Burpie, and unbalanced tyre bounces, doesnt swerve....
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Offline jaybiker

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Re: major swerve on front wheel with new tyre
« Reply #13 on: March 22, 2020, 09:43:42 am »
How bad is the 'swerve?'

I fitted a new Dunlop D606 to my X challenge, and first ride it felt a bit vague from only 90km/h and was worryingly 'floaty' at 110, I didn't want to do more.

So I went home and checked all that could be checked, lowered the rear a bit - easy on the X/C just let a bit of air out. It was only a little bit better, could run at about 125.

So I went on the forum and was advised to just give it a little time and a few more kms. Sure enough after a short while it came right and now it's all good. Thinking of getting a matching D606 for the rear. Maybe I'll have a similar experience. We'll see.

If you don't see anything obviously wrong hopefully you will also come right after a bit of settling in.
 

Offline LouisXander

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Re: major swerve on front wheel with new tyre
« Reply #14 on: March 22, 2020, 09:45:45 am »
I also thought likewise, but the MT60 is a smooth tyre, no serious knobs.
« Last Edit: March 22, 2020, 09:47:49 am by LouisXander »
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Offline jaybiker

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Re: major swerve on front wheel with new tyre
« Reply #15 on: March 22, 2020, 09:47:26 am »
Just had another thought though. Check the steering head bearings. :deal:

I gave mine just the tiniest tad of 'preload'.
« Last Edit: March 22, 2020, 09:49:19 am by jaybiker »
 

Offline BuRP

Re: major swerve on front wheel with new tyre
« Reply #16 on: March 22, 2020, 10:15:53 am »
unbalanced tyre bounces, doesnt swerve

Sure it bounces (but this is not always noticeable), and that causes the bugger to be OFF the tarmac intermittantly.... hence does anything possible, surely you know this too?  :o
But a tyre may need to 'wear in', take the high spots off, also possible.... but that ain't too different then innit?  :P
« Last Edit: March 22, 2020, 10:24:18 am by BuRP »
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Offline 2StrokeDan

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Re: major swerve on front wheel with new tyre
« Reply #17 on: March 22, 2020, 12:33:09 pm »
The swerve is not coming from the rear, is it? Check rear tyre, swingarm bearings, etc.
 

Offline Clockwork Orange

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Re: major swerve on front wheel with new tyre
« Reply #18 on: March 24, 2020, 05:57:08 pm »
The swerve is not coming from the rear, is it? Check rear tyre, swingarm bearings, etc.

I agree. The issue could be that the rear tyre has squared off and is more noticeable now with the new front. I had that issue before
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