wanna 16" rear car tire stock swingarm


Information and questions on GL1100 Goldwings (1980-1983)
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82aspen
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wanna 16" rear car tire stock swingarm

Post by 82aspen » Wed Aug 27, 2014 2:28 pm



had a quick look and the brake bracket torque arm (?) takes a huge amount of space on the left, don't see a huge problem modding that for space,

right side is very close to the swingarm with the stock 140/16 tire, dunno if a big deal using a spacer on that side to move the wheel the other way?

here's some relevant info, mainly the harley starting with a 150 m/c tire going with a 175 car tire
http://www.advrider.com/forums/showthread.php?t=816019

http://www.advrider.com/forums/showpost ... ostcount=6



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HawkeyeGL1200
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Motorcycle: 1984 GL1200 Interstate
1981 GL1100 Interstate

Re: wanna 16" rear car tire stock swingarm

Post by HawkeyeGL1200 » Thu Aug 28, 2014 12:15 pm

I have been told a car tire won't fit a GL1000, GL1100 or a GL1200 due to the rim width.

I apologise in advance if I am wrong. I looked into getting a car tire to put on the back of my 1200, and gave up shortly after beginning my search because I didn't know what I was doing... and I couldn't find anyone else with a car tire on the same model bike I have...

I'm still interested in seeing if one can be used, but not sure if I'd go to the truoble unless it was SIMPLE to do it.
I am wrong as often as I am right concerning what is wrong with someone else' motorcycle without having seen the machine in person. Guessing with limited information, as to the source of the trouble, is sketchy at best.

moritz1100
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Motorcycle: 1980 GL1100

Re: wanna 16" rear car tire stock swingarm

Post by moritz1100 » Thu Aug 28, 2014 1:44 pm

Yup, the rim width is slightly different, meaning a car tyre wont seat properly. You may be able to get around that by running it tubed instead of tubeless. First try to find a 135/90 16 tyre. Few and far between.
I had a sidecar on my 11 for years and ran it on 15" car tyres. Those wheels were constructed by unbolting the comstar hubs then mating them to 15" steel rims using steel plate discs welded at the rim and bolted at the hub. That's imo the best option if you're dead set on running car tyres. If you've got a sidecar.. If not then I can't see why you'd want to do that to your bike.

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Re: wanna 16" rear car tire stock swingarm

Post by WingAdmin » Thu Aug 28, 2014 1:45 pm

HawkeyeGL1200 wrote:I have been told a car tire won't fit a GL1000, GL1100 or a GL1200 due to the rim width.

I apologise in advance if I am wrong. I looked into getting a car tire to put on the back of my 1200, and gave up shortly after beginning my search because I didn't know what I was doing... and I couldn't find anyone else with a car tire on the same model bike I have...

I'm still interested in seeing if one can be used, but not sure if I'd go to the truoble unless it was SIMPLE to do it.
It's not the rim width that is the issue - it's the width between the swingarm arms. There is (currently, to my knowledge) no car tire that has the correct inner and outer diameters, and is also narrow enough to fit inside the swingarm of the GL1100.

moritz1100
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Re: wanna 16" rear car tire stock swingarm

Post by moritz1100 » Thu Aug 28, 2014 1:50 pm

There's a 135/90 16 tyre on the bay of e but I wouldn't ride on it. Looks like a trailer tyre from 1980.

moritz1100
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Re: wanna 16" rear car tire stock swingarm

Post by moritz1100 » Thu Aug 28, 2014 1:53 pm

You'd probably get 50'000 miles out of it though.

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82aspen
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Re: wanna 16" rear car tire stock swingarm

Post by 82aspen » Thu Aug 28, 2014 2:35 pm

i am certain 1200 rear car tire has been done and covered, there are some 15" rim fitment issues

i am also certain of at least one 1100 stock swingarm fitment but it involved a custom purpose made 15" wheel that i doubt went anywhere cos last i heard they went for ~1k, also, dunno if the folks are still around but i could prob dig up the prior info and pix

it is possible to swap to a 1200 swingarm, and even using a 1500 wheel, but that involves way more work and i'm looking for the easiest and cheapest way to go about it

it should also be clear i'll be focusing on the 82-3 1100 swingarm cos it is somewhat wider than 80-1

it is also possible to convert a comstar wheel to spokes and going to a 15" wheel, hence using a car tire but that won't be my focus

i'd like to ask a mod to change the subject to 'gl1100 wanna 16" rear car tire stock swingarm' for easier and more accurate googling for folks who may be interested

edit- here's the info on the one off 1k wheel deal, can't see the pix though unless a member
http://www.classicgoldwings.com/forum/v ... =18&t=2907
While my bike is at C Stanley Motorsports I decided to have Harry Tarzian make one of his custom 15" rear wheels for my GL1100A so I could use a car tire on the rear to maximize tire life while running a side car. Harry is the only one in this country that makes a 15" wheel conversion for the 1100 Goldwing. He uses a Centerline 4" rim, the center section of a Comstar wheel and then custom machines the wheel centers in his shop. Tire wear goes from 3-5000 miles for a motorcycle rear tire to 15-30,000 miles for a car tire. The workmanship is unbelievable.
here's a mod i've come across as a way of dealing with the stock brake torque arm, at a quick glance, looked like that would provide ~ 1" additional tire clearance space on the let side
http://cx500forum.com/forum/cx-customiz ... html#post3

http://cx500forum.com/forum/attachments ... c04283.jpg

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redbug
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Re: wanna 16" rear car tire stock swingarm

Post by redbug » Sat Jan 31, 2015 9:52 am

Try cokertire.com and see what happens
" Ridin on Tulsa Time "

SoyBoySigh
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Motorcycle: 1982 CB900F aka "CB900K0 Bol Bomber" - extensive mods with all sorts of 'WING parts, GL1100 vented rotors, GL1500 fork, GL1000 wire-spoke front hubs (putting one into a REAR wheel too) GL1000 master cylinder, etc etc - I'm working on a wire-spoke converted version of the GL1500 shrouded front brake, with the GL1500 hub cut out & drilled for spokes, but am thinking I'll use the PC800 Pacific Coast front hub.....

Re: wanna 16" rear car tire stock swingarm

Post by SoyBoySigh » Tue Sep 26, 2017 1:46 pm

I'M far more interested in moving the cross-brace toward the pivot area, so that an EIGHTEEN INCH rear wheel would fit - Either a 2.75x18" Comstar using '81-'82 CBX1050 "Pro-Link" model's rear wheel, rebuilt with the GL Comstar shaft-drive type hub - OR a "WELD-UP HUB" mod ala the CB900C based wire-spoke CHOPPER built by one "6pkrunner" on the CB750C.com four-ums, a brilliant method involving a drum hub hollowed out side-to-side, some fillet welding - and ANY read carefully ANY type of donor hub, spooled down to a cylinder on a lathe - I've got some "drum-drilled" rims in 3.50x18" Super-Akront and 4.25x18" Akront TR profiles, as well as Harley pattern drilling on 4.25x17" & 5.00x17" 40-spoke Super-Moto rims, as well as 3.0x16" Borrani & 3.50x16" Super-Akront rims drilled to suit the Honda rear hubs - and a 3.00x18" Morad drop-center shouldered rim (ie Borrani style) that's un-drilled. Plus a couple of 2.5x18" rims from Harley XLH rear wheels which means they're drilled to suit the Honda FRONT hub - Several combinations in there for matched style rims in some VERY interesting sizes!

The GOAL of course, being a Doncque "DLF-1000" style race-replica, with a Beemer boxer-twin full racing fairing, ideally with the same twin headlight look & all that - Too bad we can't get a replica of the original Doncque frame, or even the Rickman/Dresda "WING THING" for that matter. But I figure the GL1200 is the better place to start, so that with the change in overall final-drive ratio & thereby GEARING, the feel would be like a GL1000 stocker, but with a couple of extra overdrive speeds for a higher top end and lower RPM on the highway, etc etc.

It only just occurred to me though, that the swing-arm needn't be STRETCHED with a longer weld-up drive-shaft etc - You wouldn't wanna lengthen the WHEEL-BASE in any case! No - what's REQUIRED, is that the cross-brace be moved forward, and a custom UNDER-BRACE be added, like the '82 AMA Superbike racers, Freddie Spencer's & Mike Baldwin's "CB750F" AHM 1032cc monsters, once had - it's like a whole 2nd swing-arm welded under the original - Well it needn't be THAT elaborate, but the cross-brace COULD be modified in such a way that the arm is actually STRONGER than stock - albeit slightly heavier overall.

What would be AWESOME, is if we were to take the later era CROTCH-ROCKET swingers, like people are always modding onto their "STARBUCKS RACER" style crotch-rocketry .. ahem, "gentrified" (((as in the old "greasy spoon" CAFE has been replace by a Starbucks - get it?))) fugly-fied (once-were-) CLASSIC SUPERBIKES - UGH. -

A swing-arm like that could be put to FAR far better use, if swapped onto a GOLD-WING, wherein you'd remove one side and weld in a huge thick-walled hollow alloy TUBE - with a flange on the end to bolt the PUMPKIN onto - the flange and the rubber boot seal at the other end would be about the most EASY mods you could feasibly DO to a swing-arm, certainly easier than making late-model adjustable CHAIN-TYPE axle mounts - Heck even the flip-side could have the fixed small-bore axle clamp fitted, rather than worrying about an adjuster slipping loose. The whole damn thing would be ALUMINUM, far beefier looking than the OEM swing-arm, but lighter weight I'd bet, and possibly even stronger - though strong as OEM is more than sufficient and so if weight savings were the only goal I'd still regard that as a massive success!

For a more PERIOD-CORRECT version, it could be built from the CAL-FAB unit from my "CB900K0 Bol Bomber", or the reasonable facsimile which was fitted to the Suzuki Katana some four or five years later. You'd wanna be choosy about which of the later model crotch-rocket swingers you'd fit to the 'WING, 'cause the goal would always be to do a PERIOD-CORRECT style race-replica, not another "STARBUCKS RACER"!

Honestly though - just moving that BRACE seems like SUCH a simple mod by comparison! Just a bent hoop of tube around the size of a CB900F swinger, bent just tight around the fat 18" new wheel, and welded to a point equidistant from the axle and swing-arm pivot tube. Now THAT could make for a really decent under-braced set-up, and it might even weigh less than stock!



-Sigh.



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