Paralever R80R rear wheel rebuild. bare wheel out of balance.

[bighair]

Hi
(R80R rear wheel)
Did not have much joy in getting my hub skimmed , so I bought a NOS rear hub and new stainless spokes and stipped and rebuilt over the weekend.
My rear wheel took bl--dy ages to strip it , no bolt cropper, then clean out the spoke holes , cleaned the rim up a bit , the inside had some corrosion not sure if the ultraseal it had in it had something to do with that (put in by previous owner)?

I found the hardest bit getting the offset right (now within 0.2 mm measued from my old wheel assy) getting it true no real headache apart from the pits left by the corrosion giving my dial guage the flutters.

What was interesting is the fact the wheel assy is 25- 30 grams out of balance on its own ( no tyre) and when I got the bike it had 70 odd grams on it to balance it (not checked) , so I have decided to stick some weights on the inside of the rim before putting the tyre on ,hopfully meaning lesson the outside. if any providing the new tyre is well made.

I do have the 4 bolt adaptor and shaft for the hub to bolt onto so that helped make the job easier.

 

[VAL. H.]

Hi
(R80R rear wheel)
Did not have much joy in getting my hub skimmed , so I bought a NOS rear hub and new stainless spokes and stipped and rebuilt over the weekend.
My rear wheel took bl--dy ages to strip it , no bolt cropper, then clean out the spoke holes , cleaned the rim up a bit , the inside had some corrosion not sure if the ultraseal it had in it had something to do with that (put in by previous owner)?

I found the hardest bit getting the offset right (now within 0.2 mm measued from my old wheel assy) getting it true no real headache apart from the pits left by the corrosion giving my dial guage the flutters.

What was interesting is the fact the wheel assy is 25- 30 grams out of balance on its own ( no tyre) and when I got the bike it had 70 odd grams on it to balance it (not checked) , so I have decided to stick some weights on the inside of the rim before putting the tyre on ,hopfully meaning less on the outside. if any providing the new tyre is well made.

I do have the 4 bolt adaptor and shaft for the hub to bolt onto so that helped make the job easier.

I wonder if the weight bias is opposit the valve hole? Might explain it.

Are you thinking of sticking a weight on the rim inside the tyre? If so, have you thought about centrifugle forces lifting the weight off the rim and having it flailing around inside the tyre?????

If you don't want unsightly ballance weights on the rim, have a look for 'balencing beads'. These are simply poured into the tyre, either before fitting or through the valve hole. I've used them on a 650GS, they seemed to do the job fine.


Val.

 

[bighair]

Weights

Hi
I was going to use normal stick on weights in the well of the wheel as it is quite deep and cover them with duct tape it should be ok. If it does come off I will hear it banging around when checking the bike over before riding. I migh add a bead of silicon each side of the weights to help ?
And the point you made about where the out of balance bias it is opposite the valve , but i had fitted a new valve assy.
I will try and post a pic of the 4 hole adaptor ,on Hols end of the week so it might be after then if I do not get time.

 

[Redboots]

Hi
I was going to use normal stick on weights in the well of the wheel as it is quite deep and cover them with duct tape it should be ok.

Why
All tyres have a heavy point. Sometimes they are marked as heavy and sometimes as light.
Establish the "heavy" point and put it in line with the "light" point of the wheel... you may not need any weight adding to balance it.

You should always balance a wheel and tyre as a combo or you will just be adding to the unsprung weight.

John

 

[bighair]

Wheel balance

Hi
(Should say I have worked on Mcs for 30+ yrs and fitted more tyres than I care to remember so am aware rotating a tyre to avoid or the least amount of balance weights )
The wheel bare no tyre with valve assy is 30 grams out of balance (admittedly opposite the valve area)
Before I took the wheel apart it had as I said it had 70+ grams stuck on it (ugly)
Anyway fitted the new tyre today and it was only 10 grams out so all sorted.
I think the answer was that the previous tyre was either fitted by dont give a damm tyre fitter or mechanic or a totally s--t balance machine.

 

[(RIP) jings]

how about a photo of your r80r ive had one for a few years and never seen another

 

[bighair]

Photo

Photo on as soon as I get back from hols.

 

[bighair]

R80R Pics +

Hi pics of my R80R.

 

[bighair]

4 stud BMW wheel special tool

Pics of the rear wheel adaptor.

 

[MickDB1]

Bloody hell
Thats a cracking job of the Adaptor pal

 

[bighair]

Adaptor

Not my handy work sad to say it is a pukka BM one.