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Incorrect wheel size?

  • Thread starter Thread starter asetech
  • Start date Start date
A

asetech

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I pulled the rear wheel off my 80 850l and found it has a 16 inch wheel on it. It has 16Xmt2.75 stamped on it. Everything I've read on here doing searches says I should put a 130/90/17 tire on the rear. Do I have the wrong wheel on it. I also have an 81 850l parts bike that has the 17 inch wheel stamped 17Xmt2.50 on it. Should I get the tire for the 17 inch wheel and put the larger wheel on?
 
You can't put a 17" tire on a 16" wheel.

The L model bikes typically have 16" wheels so your '80 GL should havd that size. The '81 GT as shown in your signiture should be a 17". One good thing is the the wheels should interchange I think so have at it.
 
The 81 is also an l. I need to change my sig. what I was asking If I could use the 17" wheel with a 17" tire. on the '80 to lower my rpm's at cruising speeds and not have any clearance issues.
 
asetech said:
The 81 is also an l. I need to change my sig. what I was asking If I could use the 17" wheel with a 17" tire. on the '80 to lower my rpm's at cruising speeds and not have any clearance issues.
Click to expand...

Good question. Sorry, no experience.
 
Hi,

I seem to recall that Mr. Grandpa alternates between a 16" and 17" rear wheel, with no adverse affects.


Thank you for your indulgence,

BassCliff
 
Very small reduction in RPM with the 17". Go ahead and do it if you have a 17" "G" wheel
 
SqDancerLynn1 said:
Very small reduction in RPM with the 17".
Click to expand...
Does your 17" wheel have a 130 or a 120 tire on it? I believe the 120 was standard. :-k

Assuming all the measurements on the tire are exactly as claimed, here are the circumferences of the different sizes:
130/90-16 = 79.21"
120/90-17 = 80.12"
130/90-17 = 82.35"

As you can see, there is less than an inch difference between the first two, which is about 1%, and only 3.14" difference between the two 130 sizes, or about 4%.

.
 
You are correct, Mr. BassCliff.

My GS1100GK stock rear wheel was a 16-incher. It alternated service with a 17-inch wheel I had from a 1980 GS850G like yours.

Both wheels took a 130 size. No problem ever with fitment or clearance.

No such flexibility on my Yamaha Venture; all rear wheels are 16-inchers.
 
Thanks for the responses. Was there a noticeable drop in rpm going from the 16" to 17" grandpa. Thank you.
 
asetech said:
Thanks for the responses. Was there a noticeable drop in rpm going from the 16" to 17" grandpa. Thank you.
Click to expand...

Noticeable? Yes.

Significant? No.

Whenever I changed from one to the other, I would notice the slight difference in gearing. After a while, I'd get used to the new status, and go on with life.
 
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