The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: jp9094 on October 11, 2020, 04:54:23 PM

Title: r65 LS rear rim
Post by: jp9094 on October 11, 2020, 04:54:23 PM

The rear rim on my 1983 r 65 LS has an inner breaking surface that is out of spec. A new rim, while still available, is us $875 !! I managed to find a damaged rear rim for little money (US $ 40). However I am not sure about having it straightened. Please see attached photos.

I approached Woody's Wheel Works in Denver but they passed on the job saying the rim was "too old" to repair. It also needs new bearings. What does everyone think about straitening the rim based on the attached photos.

Thanks in advance for your advice,

Title: Re: r65 LS rear rim
Post by: wilcom on October 11, 2020, 11:46:00 PM

I would continue to use the old rim. I would go to thick lining if it was that far out. The back brake doesn't do much.

"Shade Tree" Joe @ your service

Title: Re: r65 LS rear rim
Post by: Justin B. on October 12, 2020, 11:08:25 AM

I agree with Joe.  Are you just wanting to replace it because it's out of spec or are you having braking issues?

Title: Re: r65 LS rear rim
Post by: Bob_Roller on October 12, 2020, 04:50:25 PM

Have you searched locally ??
I have three auto dealer complexes near me and I see mobile rim straightening businesses there quite often .

Title: Re: r65 LS rear rim
Post by: Tony Smith on October 12, 2020, 08:50:20 PM

 That rim is an excellnet candidate for straightening, the shop you approached don't wnat todo it because they would have to make a fixture to mount the rim to whilst rolling it straight. Oh how I wish that when someone doesn't want to do a job tat they wold simply say so instead of inventing bullshit reasons.

Try another shop.

As to your existing rim, it is perfectly feasible to sweat a new lining into your rim, the trick of it is finding someone who is prepared to do it and who owns a lathe big enough to swing the wheel. In case to find such a person the procedure is to turn the existing lining true then make up a new lining, not finished to final intermal diameter, as sweat it in on a fairly tight interference fit - a lot of heat will be applied to the existing linig to do this.

Once the new linign is in, turn to finished diameter. The lining will never get hot enough in service to go remotely near disturbing the interference fit and in any event bot the new and old lining will expand at much the same rate.

A more practical suggestion - already offered by Wilcom, is to take your rim, brake plate and axle to a brake ship that doe relines and have them calculate the required oversize on the linings. Remeber the dimension they give you as you will need it again the next time you need to renew your brakes.

Title: Re: r65 LS rear rim
Post by: jp9094 on October 12, 2020, 10:36:14 PM

Many thanks to all for their sage advice. The reason for all this is that there is barely any braking function left. 

Will follow up on the advice.

Thanks again to all!

Title: Re: r65 LS rear rim
Post by: Justin B. on October 12, 2020, 11:25:47 PM

Good reason.  Oh, fix your avatar url to HTTPS...

Title: Re: r65 LS rear rim
Post by: Tony Smith on October 14, 2020, 09:58:26 PM

Memo to self.

If you change the keyboard on your phone - check carefully before posting.

Title: Re: r65 LS rear rim
Post by: wilcom on October 14, 2020, 11:50:44 PM

"Memo to self.

If you change the keyboard on your phone - check carefully before posting."

I saw that Tony, So unlike our Resident Scribe from down under. Glad you have it back under control