Brake rotor?

What is the acceptable run out for a brake rotor? OK, I rechecked my numbers and the run out on my left rotor is 0.16 and the right rotor is 0.05. This is with the rotors on the bike and a dial indicator clamped to the bike.

I'm not sure of the rotor specs, but, I'd think both are out of spec. 0.160" and 0.050" is a lot in my humble opinion ... I would suspect to see like 0.006" max.

Disclaimer: my numbers would be on a test bench or rotor lathe, not just jacking up the trike and spinning the hub and rotor. lots of other possible "plays" in the later.

I need to recheck my numbers I may be off.

Back to the drawing board I need to recheck my numbers.

[QUOTE=old willie;577998]What is the acceptable run out for a brake rotor? OK, I rechecked my numbers and the run out on my left rotor is 0.16 and the right rotor is 0.05. This is with the rotors on the bike and a dial indicator clamped to the bike.[/QUOTE]

I have a 2012 Goldwing with 2013 ROADSMITH HCS trike kit. I have been unable to find a shop anywhere in Memphis, TN that has the capability to turn the rotors. They all told me that they must be turned "on the vehicle" and they had no way to handle a trike. I even went to the VW dealer and talked to the shop service foreman. Same story.

Have you compared price of new rotors versus turning old rotors?:wave4:

I’m in Jackson Tn. Lots of tire and brake repair shops with lathe machine for turning rotors. Do you have a odd design that makes it difficult to turn. Not familiar with RS Trikes. :wave4:

[QUOTE=trikeman;591401]Have you compared price of new rotors versus turning old rotors?:wave4:[/QUOTE]

At 29,500 miles I replaced the rotors & pads. Got them from ROADSMITH. $384.13! I'll just drive it and try tp enjoy the surges as I stop. I have 61,000+ on it now.

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Are they silver and gold plated?:wave4:

[QUOTE=oolddog;591396]I have a 2012 Goldwing with 2013 ROADSMITH HCS trike kit. I have been unable to find a shop anywhere in Memphis, TN that has the capability to turn the rotors. They all told me that they must be turned "on the vehicle" and they had no way to handle a trike. I even went to the VW dealer and talked to the shop service foreman. Same story.[/QUOTE]

[QUOTE=trikeman;591402]I’m in Jackson Tn. Lots of tire and brake repair shops with lathe machine for turning rotors. Do you have a odd design that makes it difficult to turn. Not familiar with RS Trikes. :wave4:[/QUOTE]

You are going to find it harder to find a tech willing to turn rotors for a bike

There are TOO many variables with run out to take a job like this

IMO, and I have turned a few bike rotors, it just aint worth it now days, not to mention the liability factor

If you have TOO much run out already you are on the losing end, replace the rotors and be safe and happy

one IMO way to correct the warped rotor is surface grind them, how ever this could cost as much as new rotors, never mind the run out, stacked tolerances and minimum machine to spec These are JMO I aint trying to scare any one, brakes are serious business, it does not matter what you ride you best be able to stop safely

[QUOTE=Jack Klarich;591430]You are going to find it harder to find a tech willing to turn rotors for a bike

There are TOO many variables with run out to take a job like this

IMO, and I have turned a few bike rotors, it just aint worth it now days, not to mention the liability factor

If you have TOO much run out already you are on the losing end, replace the rotors and be safe and happy

one IMO way to correct the warped rotor is surface grind them, how ever this could cost as much as new rotors, never mind the run out, stacked tolerances and minimum machine to spec These are JMO I aint trying to scare any one, brakes are serious business, it does not matter what you ride you best be able to stop safely[/QUOTE]

Thanks for the reply!

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Are they silver and gold plated?:wave4:[/QUOTE]

LOLOL! They should of been!!

[QUOTE=oolddog;591396]I have a 2012 Goldwing with 2013 ROADSMITH HCS trike kit. I have been unable to find a shop anywhere in Memphis, TN that has the capability to turn the rotors. They all told me that they must be turned "on the vehicle" and they had no way to handle a trike. I even went to the VW dealer and talked to the shop service foreman. Same story.[/QUOTE]

I had the same problem, mine warped out of specs, so little it could not be measured to determine which one it was, I knew it was the left, but no way to prove it. No one in my world to turn the rotors, so had to bite the silver bullet and pay up, it was painful, but the slow/stop surge was getting awful, driving me nuts. Gentlemen, that's the price we pay.

[QUOTE=bikerbillone;591525]I had the same problem, mine warped out of specs, so little it could not be measured to determine which one it was, I knew it was the left, but no way to prove it. No one in my world to turn the rotors, so had to bite the silver bullet and pay up, it was painful, but the slow/stop surge was getting awful, driving me nuts. Gentlemen, that's the price we pay.[/QUOTE]

I have same problem. Wish Roadsmith would design and use a modern braking system. I am living with mine for now.

I pulled mine and took them to a local machine shop. they turned them and now I stop nice and smooth. These rotors are not like bike rotors and they can be turned. I confirmed this with Roadsmith.

I believe the key to getting these rotors trued it finding a shop willing to try. At the very worst they fail and you lost some time trying to save rather than replace them.

Both of my discs warped and I called all the "PROS" in town that were suppose to be so great. Got a whole lot of "NO we can't do those". One of the guys at Advanced Auto told me about an old gentleman to go see. Sure enough, he had an old lathe with all sorts of adapters. $10 per disc and smooth as glass!!! :xszpv: :xszpv:

This same gentleman has since done all four wheels on my 1974 Charger SE Brougham I've been restoring for a couple years now.

Holy Christmas, wish this old school guy had been in Florida, somewhere, anywhere, I'd have been on his door step.

[QUOTE=old willie;591755]I pulled mine and took them to a local machine shop. they turned them and now I stop nice and smooth. These rotors are not like bike rotors and they can be turned. I confirmed this with Roadsmith.[/QUOTE]

Any rotor can be turned, the questions are are you checking and duplicating rotor runout before and after?

If not you will end up with a problem for sure.

Also, be very careful to index the rear rotors ( clean ALL mating surfaces including the hat area to the hub) If you do not your run out will continue to be stacked and not correct. This will lead to a good looking rotor, BUT the run out will cause vibration, noise and rapid wear of the pads. JMO from years of brake work and teaching brakes 101

Most machine shops won’t touch rotors. Too hard. I’ve had mine resurfaced on a flywheel grinder. It worked great so long as you stay in spec on thickness. Just my opinion.