Potentially stupid question about wheel balancing. - SV650.org

Dave20046 · 04-07-12, 06:20 PM

Just a last minute ****up, can anyone answer me this question 100% ?

Can I balance a wheel without the discs?

My limited mechanical knowledge / knowledge of physics says I should balance it with them on. as they're unlikely to be identically worn/manufactured... However I'm not sure how much tolerance there is to play with? In fact common sense just says; set it up how it's going to be.

And with it being a motorcycle, prospect of death and all I like to do things properly (honestly!) so I'm thinking I need to balance it with the discs on really unless anyone can give me a solid answer otherwise? i.e my expectations of how much of an exact science it is are too high.

Any relevant answers muchly appreciated!

DJ123 · 04-07-12, 06:22 PM

yes. They should have no affect on the balancing on the wheel

Dave20046 · 04-07-12, 06:24 PM

Quote:

Originally Posted by daddyjob

yes. They should have no affect on the balancing on the wheel

Is that something to do with the direction of the forces or just simply because their difference in mass will be so marginal?

DJ123 · 04-07-12, 06:27 PM

i think they are machined to a fine tolerance and should be balanced from factory. Any difference in them i imagine is so marginal you wouldn't notice them

andrewsmith · 04-07-12, 06:43 PM

Yes shouldn't cause much issue

As your balancing the wheel to the rim or balancing the rim to level out factory tolerances

Dave20046 · 04-07-12, 07:23 PM

cheers guys, will fall back on that if I can't collect my discs

jambo · 05-07-12, 08:52 AM

Ideally you'd balance the wheel with the discs on, that way all the masses involved are there at the time you're working it out.

That said, the discs have less mass and are closer to the centre of rotation, so their effect is much smaller than that of the tyre and rim together. So balancing without the discs would be better than not balancing at all. Generally these things aren't a million miles out anyway

Jambo

Dave20046 · 05-07-12, 08:59 AM

CHeers jambob!
That makes me feel less of an idiot for driving miles last night to collect them. I also forgot I have magnets in one of the discs so thought it was for the best

NTECUK · 05-07-12, 09:04 AM

Static balance you can get away with 2 grams with out much issues.
As long as they are new ,quality ones not going to cause a head ach.

joshwalker094 · 07-07-12, 08:24 PM

wheel balancing on a motorbike, i have much to learn. how do you this and why?

04-07-12, 06:20 PM	#1
Dave20046 Member Mega Poster Join Date: Jul 2008 Location: Sheffield Posts: 10,274	Potentially stupid question about wheel balancing. Just a last minute ***up, can anyone answer me this question 100% ? Can I balance a wheel without the discs? My limited mechanical knowledge / knowledge of physics says I should balance it with them on. as they're unlikely to be identically worn/manufactured... However I'm not sure how much tolerance there is to play with? In fact common sense just says; set it up how it's going to be. And with it being a motorcycle, prospect of death and all I like to do things properly (honestly!) so I'm thinking I need to balance it with the discs on really unless anyone can give me a solid answer otherwise? i.e my expectations of how much of an exact science it is are too high. Any relevant answers muchly appreciated! __________________ Last edited by Dave20046; 04-07-12 at 06:22 PM.*

04-07-12, 06:22 PM	#2
DJ123 Member Mega Poster Join Date: Jul 2011 Location: Somewhere over there Posts: 3,245	Re: Potentially stupid question about wheel balancing yes. They should have no affect on the balancing on the wheel __________________ BMW F800ST

04-07-12, 06:27 PM	#4
DJ123 Member Mega Poster Join Date: Jul 2011 Location: Somewhere over there Posts: 3,245	Re: Potentially stupid question about wheel balancing i think they are machined to a fine tolerance and should be balanced from factory. Any difference in them i imagine is so marginal you wouldn't notice them __________________ BMW F800ST

04-07-12, 06:43 PM	#5
andrewsmith Member Mega Poster Join Date: Apr 2010 Location: Newcastle upon Tyne, Just south of salad dodging country Posts: 7,750	Re: Potentially stupid question about wheel balancing Yes shouldn't cause much issue As your balancing the wheel to the rim or balancing the rim to level out factory tolerances __________________ RIP Reeder 20/07/1988 - 21/03/2012. Always missed squire!!! Every year we meet old friends, gain some new ones, lose old ones and you always remember them all. “Live as if you were to die tomorrow. Learn as if you were to live forever.” Mahatma Gandhi

04-07-12, 07:23 PM	#6
Dave20046 Member Mega Poster Join Date: Jul 2008 Location: Sheffield Posts: 10,274	Re: Potentially stupid question about wheel balancing cheers guys, will fall back on that if I can't collect my discs __________________

05-07-12, 08:52 AM	#7
jambo Member Mega Poster Join Date: Aug 2003 Location: Croydonia Posts: 5,376	Re: Potentially stupid question about wheel balancing Ideally you'd balance the wheel with the discs on, that way all the masses involved are there at the time you're working it out. That said, the discs have less mass and are closer to the centre of rotation, so their effect is much smaller than that of the tyre and rim together. So balancing without the discs would be better than not balancing at all. Generally these things aren't a million miles out anyway Jambo __________________ Modern motorcycles are bloody brilliant, enjoy it while we can

05-07-12, 08:59 AM	#8
Dave20046 Member Mega Poster Join Date: Jul 2008 Location: Sheffield Posts: 10,274	Re: Potentially stupid question about wheel balancing CHeers jambob! That makes me feel less of an idiot for driving miles last night to collect them. I also forgot I have magnets in one of the discs so thought it was for the best __________________ Last edited by Dave20046; 05-07-12 at 09:03 AM.

05-07-12, 09:04 AM	#9
NTECUK Member Mega Poster Join Date: Apr 2011 Location: essex Posts: 5,314	Re: Potentially stupid question about wheel balancing Static balance you can get away with 2 grams with out much issues. As long as they are new ,quality ones not going to cause a head ach. __________________ Raisin cookies that look like chocolate chip cookies are the reason I have trust issues.

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