Actual stock rear tire size gs1100

[katman]

who out there has a stock 1982 gs1100e or katana rear tire.

I am told it is a 114/88-17. Frankly I can't remember and all the bikes I have had were 130/90. I know the manual says 4.50 but, don't know what that translates to.

[sharpy]

130/90x17 is what ure after

[Griffin]

The standard 4.50 width is indeed right in between the 110 and 120 width.

Here's a handy chart:

http://www.650motorcycles.com/TireChart.html

[jwhelan65]

130/90x17 is what ure after

mine had a 140...here is the take off

[Nessism]

The rim is a 2.50 so a 130 tire is appropriate. Using a 140 will force the sidewalls to pinch inward too much.

My old 550T had a 4.25 tire and it looked very similar in width to a 120. I think a 4.50 would be at least as wide as a 120 despite the measured theoretical width which would suggest narrower.

[bwringer]

Most folks with that bike run a 130/90-17 with excellent results.

A 120/90-17 would probably be closer to the original size, but I think that size doesn't exist any more, at least not in a reputable brand.

[bwringer]

mine had a 140...here is the take off

Someone committed a crime upon your bike -- glad you got it changed.

You can stuff a 140/70 or 140/80 on there, and lots of goobers did so, but that doesn't make it right. The bike handles soooooo much better with the correct size tire.

[katman]

OK thanks but,

I am after the stock measurement for the original bike. I believe it is 114/88-17 that originally came with the bike.

thanks for the responses.

[bwringer]

114/88-17

Is that a typo or something? Not sure what you're asking, really.

The stock size was mentioned above, and it's on the fiche -- 4.50VX17. You're simply not going to find that exact tire size -- no one has made them for a decade or so.

Are you going for a 100 point restoration or do you want to ride?

[katman]

Is that a typo or something? Not sure what you're asking, really.

The stock size was mentioned above, and it's on the fiche -- 4.50VX17. You're simply not going to find that exact tire size -- no one has made them for a decade or so.

Are you going for a 100 point restoration or do you want to ride?

was interested in the number that was on the stock tire

[Nessism]

Back in the day I think the aspect ratio was 100% of the width so from a theoritical standpoint you want a 114/100-17.

BTW, 120/90-17 tires are available - Avon makes a Roadrider in that size.

[Rudeman]

OK thanks but,

I am after the stock measurement for the original bike. I believe it is 114/88-17 that originally came with the bike.

thanks for the responses.

It came with a 4.50V17, probably a Bridgestone Mag Mopus. If you multiply 4.5 by 25.4 (number of millimeters in 1 inch) you will get 114.3.

English to metric conversions usually result in compound fractions. I would go with a 120/90V17 or a 130/90V17

[katman]

Thanks "Rudeman" I guess I will have to settle for that.

[katman]

Ok,

I just finnished a sheet of info on my site. I have posted some charts that may help a few people.

top speed changes with sprocket teeth. rpm changes, mph and kph. These are for 1100 bikes only but they give a good picture of the pattern of change with the number of teeth changed.

bottom of the page. http://www.robwilton.com/sprockets_gearing.html

[mighty13d]

"When you you got your bike it probably had a 130/90-17 tire on it. The stock tire for a 1982 and 1983 Gs1100 Katana is 114/88-17 (4.50v 17) This has already changed your gearing by 3 mph (5 kph) @ 4000 rpm. The 130 tire is larger than the stock one so you are traveling 66 mph (106.5 kph) @ 4000 rpm instead of 62 mph (100 kph)"


Don't be misleading and allow people to thing that when their speedo says 62 mph, that they are really going 66. That's not true. The speedo runs off the front tire so no matter what the gearing to the rear is, the front is correct if the right tire is on front. Maybe you should stipulate that? or at least take out the extra "you" at the beginning of that paragraph?

EDIT: I know you aren't actually saying that your speedo is off, but it's easy enough for someone to think that is what you are saying.