How to get more clearance between left front rotor and caliper mount?


Information and questions on GL1100 Goldwings (1980-1983)
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bofler
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How to get more clearance between left front rotor and caliper mount?

Post by bofler »



I'm having an issue with not having enough clearance between the outside of the rotor and the left front caliper mount. The minimum is supposed to be .7mm and I am close, but would like to have a bit more room. The manual says to push the fork tube out if you need more clearance, but is that even possible on the left side. The threaded axle sleeve pretty much locks the fork into place. The only way I can think of to get more clearance is loosen the sleeve so that it pulls the fork out as it unthreads along the axle. But then you don't have any torque on the sleeve. Any solutions?


johnny42
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Re: How to get more clearance between left front rotor and caliper mount?

Post by johnny42 »

I recently replaced my tires and installed the front wheel knowing I had to have that clearance. I read the DIY and, like you, read where you're supposed to push/pull the forks but when you tighten the axle, you lose that clearance.

How I solved the issue was to just make sure the wheel spun freely. That's the best I could do.

If there's a better solution out there, please share.
bofler
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Re: How to get more clearance between left front rotor and caliper mount?

Post by bofler »

The right side can move a few millimeters with a bit of muscling, but I can't think of any way that the left side could be adjusted. I'm not too far off from the spec, but would like to get it in the best condition I can considering how much cash I've just put into rebuilding the whole brake system.
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bruce swaybill
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Re: How to get more clearance between left front rotor and caliper mount?

Post by bruce swaybill »

I wouldn’t push too hard. I’ve never pushed and never had a problem because the calipers float on those shoulder bolts you should have lubed before mounting the calipers. Before mounting you should spread the pads apart. Once mounted and before pulling the lever you should be able to slide the caliper left and right. If not something is bound up. If yes, you can pull the brake lever a few times the pistons will extend and the pad contact will center the calipers and should provide clearance when released to allow the wheel to spin free without much of a drag sound.
Good luck!👍
Bruce S.
Have a nice day! :)
bofler
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Re: How to get more clearance between left front rotor and caliper mount?

Post by bofler »

bruce swaybill wrote: Wed Jul 29, 2020 4:47 pm I wouldn’t push too hard. I’ve never pushed and never had a problem because the calipers float on those shoulder bolts you should have lubed before mounting the calipers. Before mounting you should spread the pads apart. Once mounted and before pulling the lever you should be able to slide the caliper left and right. If not something is bound up. If yes, you can pull the brake lever a few times the pistons will extend and the pad contact will center the calipers and should provide clearance when released to allow the wheel to spin free without much of a drag sound.
Good luck!👍
Bruce S.
hey bruce...well, i'm talking about the caliper mount. yeah, the caliper itself should float into position, but the mount doesn't move. the rotor runs through a narrow channel on the mount and the honda specified minimum clearance is 0.7mm on both sides. if the mount drags on the rotor it will mess it up pretty badly.
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bruce swaybill
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Re: How to get more clearance between left front rotor and caliper mount?

Post by bruce swaybill »

What year is you bike?
Pictures may help.
Bruce S.
Have a nice day! :)
johnny42
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Re: How to get more clearance between left front rotor and caliper mount?

Post by johnny42 »

Our bikes are 1983 Goldwing Interstates
bofler
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Re: How to get more clearance between left front rotor and caliper mount?

Post by bofler »

i have an '83, but i think it's the same for all years. the left side of the axle has a threaded sleeve (torqued to 42 ft/lbs) that the fork slides into. the fork can't move at all on that side because it's locked in by the shoulders on this sleeve. the right side, however, doesn't have this, so you can (with a good amount of pushing or pulling) move the fork a tiny bit along the axle. you can see the clearance between rotor and caliper mount i'm talking about in this photo from the front wheel installation how-to.
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bofler
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Re: How to get more clearance between left front rotor and caliper mount?

Post by bofler »

my rotor is a tiny bit warped and so that's why i'm trying to see if more clearance is possible. the rotor needs to be replaced, i know. but to this point i've only put a few hundred miles on the bike, and the dollars put into the bike are way exceeding the miles after completely redoing the brake system. i need to put some more miles on the bike before i know it's worth dropping money on new rotors (the rear probably needs to be replaced as well).
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bruce swaybill
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Re: How to get more clearance between left front rotor and caliper mount?

Post by bruce swaybill »

So the ‘bracket’ you mentioned is the the TRAC system swing arm that the caliper mounts to, correct?
And it looks like this?:


I ask because your picture does not look like an 83...

And you have mounted the bracket first then the caliper, right?

Have you checked to see that the forks are straight and parallel?

Is it the bracket or the screws that are close to the disk? I had to grind one screw a little shorter to add clearance once.

Oh, I think you have it backwards: finish the job now, get new rotors and you won’t have to worry the front brakes for years. Don’t fudge it now so the bike has to ‘pay’ in miles for more TLC. You may not be happy the result if you fudge it.

Just thinking out loud....
Last edited by bruce swaybill on Wed Jul 29, 2020 8:50 pm, edited 1 time in total.
Have a nice day! :)
bofler
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Re: How to get more clearance between left front rotor and caliper mount?

Post by bofler »

bruce swaybill wrote: Wed Jul 29, 2020 8:35 pm So the ‘bracket’ you mentioned is the the TRAC system swing arm that the caliper mounts to, correct?
And it looks like this?:

79530F2A-B9C4-4F9C-8057-52C7BC9C4BD8.jpeg

And you have mounted the bracket first then the caliper, right?

Have you checked to see that the forks are straight and parallel?

Is it the bracket or the screws that are close to the disk? I had to grind one screw a little shorter to add clearance once.

Just thinking out load....
yeah, i guess you could also refer to it as the trac swing arm, seeing as it it is integrated with the trac system. this is the only place that could rub with the rotor, apart from the brake pads, assuming everything is installed properly. the manual talks about this. the manual says to push the forks in or out to get the proper clearance. i'm just not sure that this is actually possible on the left side.

bracket mounted first, then caliper. i've done the best i could to make sure the forks are straight in the triple. no screws involved in this issue.

i think i will be fine. it's not rubbing, but seeing as my rotor is slightly warped, i am getting moments where there isn't enough clearance (0.7mm, as specified by the manual). i'll roll with it. if the rotor gets destroyed, no big deal because it needs to be replaced anyway.
johnny42
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Re: How to get more clearance between left front rotor and caliper mount?

Post by johnny42 »

I've seen folks decide to just keep their pitted rotors and just keep replacing pads. Those folks say rotors for old bikes are hard to get and very expensive, so they just replace pads as needed. Warped? That might be a different story.
bofler
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Re: How to get more clearance between left front rotor and caliper mount?

Post by bofler »

johnny42 wrote: Wed Jul 29, 2020 9:20 pm I've seen folks decide to just keep their pitted rotors and just keep replacing pads. Those folks say rotors for old bikes are hard to get and very expensive, so they just replace pads as needed. Warped? That might be a different story.
let's see how they function after i'm finished rebuilding. it's only the front left that is a bit warped. not sure if it already was when i got the bike, but i noticed now as i have been rebuilding the brakes. the rear is probably a bit thin (haven't measured) and its got some grooves in it. there are replacement ebc rotors for around 200 dollars each. but for the moment i will replace the 25 dollar brake pads earlier than they should be replaced rather than dropping several hundred dollars on rotors for a bike that hasn't seen more than 200 miles under my command.
Tekko
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Re: How to get more clearance between left front rotor and caliper mount?

Post by Tekko »

Sorry to resurrect an old thread, but I'm having this exact problem (left front caliper mount clearance issue). The only issue is, there is so little clearance between the left mounting bracket and the rotor that I can't even get the bracket back in place. I see the bracket wasn't aligning for the last owner, because the rotor has worn a large shiny spot on the bracket. In attempting to correct this, I now have a wing that I can't reassemble. :(

I would pull on the left fork to make more room, but it's already out as far as the axle nut will let it go. The right side lines up like normal and everything looks good.

Any advice would be much appreciated.
Tekko
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Re: How to get more clearance between left front rotor and caliper mount?

Post by Tekko »

Upon further inspection, it appears that I probably need a spacer/washer between the speedo assembly and the axle nut to create the clearance necessary for the caliper mounting bracket to swing into place.

Does anyone else have a bushing/spacer between the speedo housing and the axle nut? I'm measuring 1.125" between the right fork and front wheel at the axle, but only 1" between the left fork and front wheel at the axle. This would lead me to believe a 1/8" bushing/spacer should get me closer to my goal.
johnny42
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Re: How to get more clearance between left front rotor and caliper mount?

Post by johnny42 »

See if you can access a parts fiche for your model. That should tell you if there's a spacer (in case no one responds).
Tekko
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Re: How to get more clearance between left front rotor and caliper mount?

Post by Tekko »

It doesn't look like there was a spacer from the factory. I wonder if it would be safe to add one if that's what it takes to get the clearance I need?

I see the spacer that's labeled as 5, but I don't see anything between the speedo housing (10) and the axle nut (18), which is where I'm limited currently.
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sjk4
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Re: How to get more clearance between left front rotor and caliper mount?

Post by sjk4 »

I had the same problem on my '83 1100i. The rotor just lightly rubbed on the left caliper braket. After much head scratching, studying it, reading the manual again and again, and giving it much thought I went to the hardware store and found a thin stainless steel washer that was almost the right size to fit over the axle. I had to grind it out just a little bit so it would fit over the axle and used it as a spacer betweent the speedo drive unit and the axle nut. This moved the wheel to the right just enough that the clearance between the rotors and the brakets is perfect on both sides.

Good luck
Tekko
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Re: How to get more clearance between left front rotor and caliper mount?

Post by Tekko »

Thanks for the input! I'm installing a 5/8" lock washer and it appears to fit perfectly!

Any safety concerns regarding the addition of another part in the axle assembly? It seems like it hasn't affected handling at all. The brakes work well, and the grinding noise I was hearing earlier is completely gone. (And of course I now have a working speedometer)
sjk4
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Re: How to get more clearance between left front rotor and caliper mount?

Post by sjk4 »

I have not had any issues at all. I'm glad you got it sorted. Spring is here and it's time to ride.


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