new tyres wheel balancing issue help? - SV650.org

05-03-10, 04:14 PM

I just had some avon storm ultras fitted. The rear went on fine got balanced all ok.

However the front when put on the machine needed a 25 gram weight and a 90 gram weight. My mechanic was shocked. So he deflated tyre rotated the tyre around the rim 180 degrees and balanced again but this time it came to 75 grams instead of 90. he was still shocked and put the weights on and said report back as he was still not convinced.

Now at speeds of 30+ and also under harsh acceleration theres is notable shake in the steering and naturally gets worse the quicker i go.

went back to him today and he said take the weights off and see how it is, still shaking. i'm taking it back to him on tuesday but any help as to what the problem is would be great. Could it be a duff tyre?

its a k9 sv650s btw.

thanks

Luckypants · 05-03-10, 04:16 PM

Indeed that sounds like a bad tyre, your fitter should take it off and fit a replacement, send that one back to Avon as a dud. If with all those weights on it, it still does not run balanced, then it is not fit for purpose / of merchantable quality IMO and should be replaced FoC.

fastdruid · 05-03-10, 04:18 PM

I came across this the other day which makes interesting reading re wheel / tyre balancing.

http://www.peterverdonedesigns.com/mctires.htm

Druid

Spanner Man · 05-03-10, 05:02 PM

Good afternoon all.

Before condemning the tyre, have you tried balancing the wheel without the tyre fitted? I have come across cases where it's a wheel issue, such as worn bearings that cause an excess of weight to be required to achieve a good balance.

Cheers.

punyXpress · 05-03-10, 05:03 PM

Can't fathom out why wheel imbalance is at anything other than at the valve or 180 degrees away. Unless it is affected by brake discs?

Sid Squid · 06-03-10, 10:07 AM

Quote:

Originally Posted by Spanner Man

worn bearings

First thing I'd check in this circumstance.

Quote:

Originally Posted by punyXpress

Can't fathom out why wheel imbalance is at anything other than at the valve or 180 degrees away. Unless it is affected by brake discs?

Few wheels alone are bang on balance, but they're rarely far off, and where that imbalance is varies.

06-03-10, 10:10 AM

cheers for the replies, will ask my mechanic to look into all ofthe issues raised.

however you really think it would be bearings, considering its just under 1.5 years old?

cheers

Sid Squid · 06-03-10, 10:32 AM

It's certainly not a long life, but, stranger things have happened.

05-03-10, 04:14 PM	#1
ahmedf Guest Posts: n/a	new tyres wheel balancing issue help? I just had some avon storm ultras fitted. The rear went on fine got balanced all ok. However the front when put on the machine needed a 25 gram weight and a 90 gram weight. My mechanic was shocked. So he deflated tyre rotated the tyre around the rim 180 degrees and balanced again but this time it came to 75 grams instead of 90. he was still shocked and put the weights on and said report back as he was still not convinced. Now at speeds of 30+ and also under harsh acceleration theres is notable shake in the steering and naturally gets worse the quicker i go. went back to him today and he said take the weights off and see how it is, still shaking. i'm taking it back to him on tuesday but any help as to what the problem is would be great. Could it be a duff tyre? its a k9 sv650s btw. thanks

05-03-10, 04:16 PM	#2
Luckypants Moderator Mega Poster Join Date: Jul 2003 Location: Nr Ruthin Posts: 7,079	Re: new tyres wheel balancing issue help? Indeed that sounds like a bad tyre, your fitter should take it off and fit a replacement, send that one back to Avon as a dud. If with all those weights on it, it still does not run balanced, then it is not fit for purpose / of merchantable quality IMO and should be replaced FoC. __________________ "Your Viffer sounds like it is raising hell! Spot on." - Witchery 17/4/08 Snow Plough Appreciation Society - Member #3

05-03-10, 04:18 PM	#3
fastdruid Member Mega Poster Join Date: Jul 2003 Location: W Mids Posts: 2,037	Re: new tyres wheel balancing issue help? I came across this the other day which makes interesting reading re wheel / tyre balancing. http://www.peterverdonedesigns.com/mctires.htm Druid __________________ '00 SV700S - '94 RVF400R - '97 RVF400R - '88 VFR750F

05-03-10, 05:02 PM	#4
Spanner Man Member Mega Poster Join Date: May 2005 Location: Sunbury Middlesex Posts: 1,396	Re: new tyres wheel balancing issue help? Good afternoon all. Before condemning the tyre, have you tried balancing the wheel without the tyre fitted? I have come across cases where it's a wheel issue, such as worn bearings that cause an excess of weight to be required to achieve a good balance. Cheers. __________________ Spanner Man http://stewarts-motorcycles.co.uk/default.html

05-03-10, 05:03 PM	#5
punyXpress Member Mega Poster Join Date: Feb 2008 Location: Riding, North Posts: 2,664	Re: new tyres wheel balancing issue help? Can't fathom out why wheel imbalance is at anything other than at the valve or 180 degrees away. Unless it is affected by brake discs? __________________ Was: K2 naked in rapid yellow - gone to a better? place Now: Street Triple R

06-03-10, 10:10 AM	#7
ahmedf Guest Posts: n/a	Re: new tyres wheel balancing issue help? cheers for the replies, will ask my mechanic to look into all ofthe issues raised. however you really think it would be bearings, considering its just under 1.5 years old? cheers

06-03-10, 10:32 AM	#8
Sid Squid No, I don't lend tools. Mega Poster Join Date: Jul 2003 Location: Skunk Works, Nth London Posts: 8,680	Re: new tyres wheel balancing issue help? It's certainly not a long life, but, stranger things have happened. __________________ If an SV650 has a flat tyre in the forest and no-one is there to blow it up, how long will it be 'til someone posts that the reg/rec is duff and the world will end unless a CBR unit is fitted? A little bit of knowledge = a dangerous thing. "a deathless anthem of nuclear-strength romantic angst"

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