Tire Sizes


Information and questions on GL1000 Goldwings (1975-1979)
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geo steinke
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Motorcycle: 1976 gl1000 goldwing

Tire Sizes

Postby geo steinke » Fri May 07, 2010 1:50 pm



I have two Goldwings. A 1976 and a 1981. The 81 takes a 110/90-19 for the front and a 130/90-17 for the rear. The 76 takes a 3.50-19 for the front and a 4.50-17 for the rear. I have found the size tires for the 81 but not the 76. Both have 19 for the front and 17 rears. Are the numbers 110/90 and 130/90 the same as the 3.50 and 4.50? Did they change tire size number between the years. Thanks



Dltroper
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Motorcycle: 1978 GL1000 Goldwing

Re: Tire Sizes

Postby Dltroper » Wed May 12, 2010 10:24 pm

Hey there, Go to weeks motorcycle .com or type in search motorcyle tire sizes they explain it better than I can, I have mm90-19 up front and mr 90-16 on my 78 dunlop elite ll Hope this helps, David in Ca.

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thrasherg
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Re: Tire Sizes

Postby thrasherg » Thu May 13, 2010 11:20 am

Geo, the old tyre sizes where in inches and modern tyre sizes are in mm (this is only for the width, the diameter stays in inches and the sidewall profile was not specified in the old measurements!), so you convert the old measurement to new by multiplying by 25.4 and then rounding up to the nearest size. ie 3.50-19 would be 3.5*25.4 = 89 so you need to find a 90/xx - 19 or a 100/xx - 19 tyre, the 4.5" tyre would be 4.5*25.4 = 115, so you could go for a 120 or 130 width tyre. For the sidewall you need to see what profiles are available in the width you want and then try to find whatever is closest to the original tyre, if you get it wrong it won't really have much effect except to mess up the speedometer accuracy. Handling might change a bit but is very unlikely.

In case you didn't know, the current tyre sizing is "tyre-width/sidewall profile - wheel diameter", so a "100/80 - 19" is a tyre that is 100mm wide, has a sidewall that is 80% of it's width (80mm in this example) and fits on a 19 inch wheel. Knowing this you can then calculate the rolling diameter of your tyre and then if you want to change your tyre for a diferent width or sidewall profile you can calculate the error that your speedo will give..

Gary

geo steinke
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Motorcycle: 1976 gl1000 goldwing

Re: Tire Sizes

Postby geo steinke » Thu May 13, 2010 12:35 pm

Thanks for the help. I did some research and found that load rating and speed ratings are involved also. I looked around on the website and found some info on other tires that guys have used. Avon tires where suggested so I looked for them. I called a tech at JP Cycle and he suggested the Avon Roadriders for both bikes. The 76 has spoked wheels so they will need tubes and the 81 has mag wheels so I just need the tires. Continnenal tires also where suggested for the bike as well. Don't know if I like the thread pattern on them. Still debating on which way to go. After that were going to learn how to change them. Aslo seen an article on Dyna Beads, I believe I'm also going to try them. This is a great website for info, keep up the great work.

Thanks,
geo

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WingAdmin
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Re: Tire Sizes

Postby WingAdmin » Thu May 13, 2010 12:55 pm

I just put a set of Avon Venoms on my 1100, and I used Dyna Beads, and I can recommend them both. I had been told by several people that if I spent the few extra dollars for the Avon tires, I wouldn't be sorry - and I'm not.

geo steinke
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Re: Tire Sizes

Postby geo steinke » Thu May 13, 2010 1:10 pm

I inquired about those tires but he suggested the Roadriders because there was matching size for the front and the back. With the Avon Venoms there was one tire size (front or Back can't remember) wasn't made in that tire.

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thrasherg
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Re: Tire Sizes

Postby thrasherg » Thu May 13, 2010 1:17 pm

In my younger days I use to run Avon road runners on all my performance bikes and loved them, no reason to believe they would not be an excellent choice for your wings..

Gary

Old Fogey
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Re: Tire Sizes

Postby Old Fogey » Fri May 14, 2010 9:35 am

I love Bridgestone tyres. My bike has tubed BT45s, 100/90 x19 and 130/90 x 17 on 79 Comstars.

If you want more mileage with a little less grip, go for the Spitfires (not available in UK or Europe!)
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geo steinke
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Re: Tire Sizes

Postby geo steinke » Tue Jun 01, 2010 12:47 pm

Finish replacing both tires on the bike this weekend. First off thanks for the HOW-TO-ARTICLES, they atr great. I replaced both tires and added Dyna Beads to both. Secondly I tried but could not pry the tires from the rims. After smashing one finger I ask my self what waas I doing. I'm changing tires because the one olds are bad. So I proceeded to the tool box and removed the recipracating saw with a metal blade and I cut the tires off. So much easier, I do recomend useing the rim savers just incase the saw gets close to the rim. I pried the beads out as far as possiable and cut away. Once again thanks for all the tips. Oh too great tip on using STP Son of a Gun instead of soapy water, WORKS GREAT.

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IronMike
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Re: Tire Sizes

Postby IronMike » Fri Jul 02, 2010 2:12 am

Old Fogey wrote:I love Bridgestone tyres. My bike has tubed BT45s, 100/90 x19 and 130/90 x 17 on 79 Comstars.

If you want more mileage with a little less grip, go for the Spitfires (not available in UK or Europe!)


Hi all,

Since they are available in the US, I put some Bridgestone Spitfires on my 79 GL1000 (90/90 x 19 and 130/90 x 17). They work great. I haven't had any trouble with he grip, but they do seem like they have a harder compound than the Dunlop tires that were on it when I acquired the bike.

I do recommend that you check the wheel bearings when you change the tires. Especially on these older bikes. A few dollars of prevention may save you some embarrassment, and perhaps even a trip to the emergency room. I could tell the PO had never changed them in a while, as there was tremendous play in them and one was real dry. After replacement of tires and bearings, my bike handled much better than before.

geo steinke
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Joined: Wed Apr 07, 2010 12:11 pm
Location: davenport, iowa
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Re: Tire Sizes

Postby geo steinke » Fri Jul 02, 2010 7:16 am

Thanks for the info IronMike. I checked out the pictures of your bike, nice add ons to the bike. I think your bike was red, right. I couldn't see the tires. Remember "Ride hard or stay home"

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IronMike
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Re: Tire Sizes

Postby IronMike » Fri Jul 02, 2010 8:59 am

geo steinke wrote:Thanks for the info IronMike. I checked out the pictures of your bike, nice add ons to the bike. I think your bike was red, right. I couldn't see the tires. Remember "Ride hard or stay home"


Thanks, and yes, I was going for Iron Man red, I think it turned out pretty good. It does have the Spitfires in it in those. I took an old Cafe Racer faring I had used on my 1980 CB750 Super Sport back in the '80s and had to customize a mount and re-locate the side reflectors. I still need to build a better brackets for the reflectors. I also had to notch the bottom a little on the sides for the turn signals to clear so it would sit properly around the headlight. I have seen the same faring on JC Whitney and Dennis Kirker's sites for about $60 to $70.




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