Author Topic: wooble rear tyre (rim) is there a serious problem?  (Read 138 times)

Offline foliver

  • ^ Proficient Motobricker
  • Posts: 177
wooble rear tyre (rim) is there a serious problem?
« on: September 17, 2023, 12:18:32 PM »
Hello, all long time without writing.
My K75 has the rear rim with a punch (i went into a hole in the street, and boom), and i cannot find someone who can straighten it in my country, no motorcyles rim repair...at leat this kind.
I mounted new tyres and i've had a little air pressure lost, but now is ok, after good inside rim cleaning.
But i see it with a little movement, i cannot feel anything while riding.
Any advice on that? no big deal? big deal?

I'm planning to travel a bit in december.........
here a vid and a picture

https://youtube.com/shorts/5vdMY8zgpCk?feature=share

Thaks for your opinions!!!
  • Montevideo, Uruguay
  • Bmw K75C 86

Offline Duckbubbles

  • Motobrick Curious
  • Posts: 16
Re: wooble rear tyre (rim) is there a serious problem?
« Reply #1 on: September 18, 2023, 01:17:21 PM »
Those "Y" spoked wheels are quite soft and do dent easily.  From what I can see in the pic, I wouldn't worry too much about it.
If you want to try a fix:
Take the wheel off and deflate the tire.  Dent side up and use a plastic faced dead blow hammer or a piece of 2X4 wood and a good sized metal hammer and work over that area until you work most of the dent out.  The  back side of the tire on the ground might cushion the hammering so it may take quite a bit of effort. 
I have worked out numerous dents in my front wheels (never had a rear dent) over the years, usually at a tire change using a Magic Marker while spinning the wheel on the axle to mark the spots needing attention.
Or just live with it.

Frank
  • Austin, Texas USA
  • 1985 K100/1100RS
'85 K100/1100RS 38 years, 330,000 mi.
'23 R1250RS
'03 R1100S BCR #6/200
500,000+ BMW miles

Offline foliver

  • ^ Proficient Motobricker
  • Posts: 177
Re: wooble rear tyre (rim) is there a serious problem?
« Reply #2 on: September 18, 2023, 11:34:29 PM »
Hello Franck, thanks for your reply.
i'll follow your sugestion, before atempting any long trip.
I didn't knew it was easy as iron rims, i was affraid that aluminium cracks, but after your experience i supose it's elastic too.
txs!
  • Montevideo, Uruguay
  • Bmw K75C 86

Offline The Mighty Gryphon

  • Administrator
  • ^ Quintessential Motobricker
  • Posts: 6530
Re: wooble rear tyre (rim) is there a serious problem?
« Reply #3 on: September 19, 2023, 10:54:51 AM »
Because the wheels were designed for tubeless tires BMW used a softer, less brittle aluminum alloy.

A harder alloy has the danger that on a hard impact the rim can crack and cause a rapid loss of air pressure.  Needless to say, this can be very painful at high speed.  A softer rim will deform on a hard impact, but it will keep holding air, and can be repaired if one goes about it slowly and carefully. 

As was mentioned, a heavy hammer and a couple wooden blocks with a little patience is all that you need to get the wheel back to reasonably close shape.
  • In my garage in Marilla, NY
  • '91K100RS White/Blue
Current:
'91 K100RS16V "Moby Brick Too"

Past:
'94 K75RT "Ilsa, She Wolf of the SS"
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline foliver

  • ^ Proficient Motobricker
  • Posts: 177
Re: wooble rear tyre (rim) is there a serious problem?
« Reply #4 on: September 19, 2023, 11:04:35 AM »
Your two responses were the best news I could have received.
Txs Mighty!
  • Montevideo, Uruguay
  • Bmw K75C 86

Offline beemuker

  • ^ Quintessential Motobricker
  • Posts: 1092
Re: wooble rear tyre (rim) is there a serious problem?
« Reply #5 on: September 19, 2023, 02:14:18 PM »
 Iíve got an extra rear rim
  • Panama City, FL
  • '00 R1100RT,í92 K75 RT,past tense:'83 R80ST, '93 K1100LT,,94 R1100RS K75s, Honda NC700, Suzuki Bandit 1200, bmw R75/5 Honda 750
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