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Actual stock rear tire size gs1100

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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.
 
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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

TireChart.jpg
 
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.
 
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.
 
jwhelan65 said:
mine had a 140...here is the take off

kenda2.jpg
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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.
 
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.
 
katman said:
114/88-17
Click to expand...


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?
 
bwringer said:
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?
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was interested in the number that was on the stock tire
 
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.
 
katman said:
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.
Click to expand...

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
 
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
 
"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.
 
mighty13d said:
"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.
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Is that what you you get from that? That is not what I am saying. I am trying to point out the changes of speed and rpm. The speedo is correct yes but they may be wondering why the tach is screaming or seems behind. I will read it again and see what I can do.

I fixed that typo as well, thanks.
 
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katman said:
Is that what you you get from that? That is not what I am saying. I am trying to point out the changes of speed and rpm. The speedo is correct yes but they may be wondering why the tack is screaming or seems behind. I will read it again and see what I can do.

I fixed that typo as well, thanks.
Click to expand...


I don't know, don't listen to me.. I'm working on 38 hours of being up and at least 3 more to go before I get home. If it sounds good to you, leave it! :)
 
mighty13d said:
I don't know, don't listen to me.. I'm working on 38 hours of being up and at least 3 more to go before I get home. If it sounds good to you, leave it! :)
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Well if one guy took it wrong than another can too. I have rewrote it. Maybe it reads better now. have put in about 50 hrs on the site and my eyes are pretty square as well. I see I even spelled tach wrong...ahahahahahaha
 
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katman said:
Well if one guy took it wrong than another can too. I have rewrote it. Maybe it reads better now. have put in about 50 hrs on the site and my eyes are pretty square as well. I see I even spelled tach wrong...ahahahahahaha
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??????????????? It took them 15 posts to say what i already said that ure bike takes a 130/90x17 tire. Now ure confusing people with ratios!!!!!!!!!!!!!!!!! arghhhhhhhhhhhhhhhhhhhhhhh
 
sharpy said:
??????????????? It took them 15 posts to say what i already said that ure bike takes a 130/90x17 tire. Now ure confusing people with ratios!!!!!!!!!!!!!!!!! arghhhhhhhhhhhhhhhhhhhhhhh
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Sorry, thought this was the TECH! section .......!!!!!!!!!!!!!xxxxxxxxxxx=======+++++++________-----------and by the way, I asked the quesion and...... it wasn't the right answer.
 
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