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1Back to top Go down   tires taller? Empty tires taller? Wed Nov 04, 2015 8:51 pm

Ken52

Ken52
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Hi gentleman, just a quick question if you would.the size of the tire on my 85 k100rt rear,is a 130/80 17 58h, is this a stock size? what I've read is that stock is a 130/90 17. is this a taller tire? thanks study

    

2Back to top Go down   tires taller? Empty Re: tires taller? Wed Nov 04, 2015 9:14 pm

Rick G

Rick G
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It would be 26mm larger in diameter thats 1 inch


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1986 K75 GS.
    

3Back to top Go down   tires taller? Empty Re: tires taller? Wed Nov 04, 2015 10:33 pm

JR_K100RS

JR_K100RS
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G'day Ken , take a look at this link , you can use it to compare different tyre sizes , just fill in the stock tyre size ( as Rick stated 130/90/17 ) and then the tyre size you want to compare , I use it all the time

www.tacomaworld.com/tirecalc

John Re


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Diamond Grey ( 617 ) 1987 K100RS ( European Delivery ) Original owner
    

4Back to top Go down   tires taller? Empty Re: tires taller? Thu Nov 05, 2015 1:01 am

AL-58

AL-58
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Ken52 wrote:Hi gentleman, just a quick question if you would.the size of the tire on my 85 k100rt rear,is a 130/80 17 58h, is this a stock size? what I've read is that stock is a 130/90 17. is this a taller tire? thanks study
Some people fit a 130/80-17 instead of the original 130/90-17 to get the seat a bit lower.

Al


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)  sc25 

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

tires taller? K-dogs10
    

5Back to top Go down   tires taller? Empty Re: tires taller? Thu Nov 05, 2015 6:35 am

92KK 84WW Olaf

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I have a 140/80 on the rear instead of the 130/90. Bridgestone BT45.

Sometimes what is fitted will depend on your tyre preferences as not every size is available from every manufacturer.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 49,840 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

6Back to top Go down   tires taller? Empty Re: tires taller? Thu Nov 05, 2015 12:06 pm

Two Wheels Better

Two Wheels Better
Moderator
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The '80' or the '90' you're enquiring about is called the aspect ratio. It generally means that the tyre's 'height' is that percentage of the tyre's width. So, 130/90x17 is 130mm wide, the sidewall is 90% of the width x 17, the number of inches of the wheel diametre. In short, a smaller aspect ratio will mean a smaller rolling diametre, which is a 'shorter' tyre. The stock 'Y' five spoke rear K wheel takes a 130/90-17, however, many of us use 140/80-17 to get a slightly larger footprint without changing the speedo ratio too much. Same goes for the front wheel. Stock is 100/90-18, a good plus one size is 110/80-18.


__________________________________________________

1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, #1 '06 K1200R, #2 '06 K1200R, '07 K1200R, '09 K1300GT, '13 R1200RT-P & 2022 S1000XR

"Do you ever read any of the books you burn?" "That's against the law!" "Oh, of course."
~Ray Bradbury, science-fiction writer (22 August 1920 - 2012)
    

7Back to top Go down   tires taller? Empty Re: tires taller? Thu Nov 05, 2015 5:02 pm

AL-58

AL-58
Life time member
Life time member
Standard: 130/90-17
Radius 333mm
Circumference 2093mm

Small/Low: 130/80-17
Radius: 320mm (bikes sits 13mm lower than standard, with no other mods)
Circumference: 2011mm
Effect on gearing: Engine revs approx 4% higher than standard

Wide option: 140/80-17 (Standard on some later RSs)
Radius: 328mm (bike sits 5mm lower than standard, probably not even noticeable)
Circumference: 2061mm
Effect on gearing: Engine revs approx 1.5% higher than standard

Hope it helps

Al


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)  sc25 

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

tires taller? K-dogs10
    

8Back to top Go down   tires taller? Empty Re: tires taller? Thu Nov 05, 2015 5:35 pm

92KK 84WW Olaf

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I changed from a 130/90 rear to a 140/80. Not noticeable simply because the worn diameter of the 130/90 is so close to a new diameter 140/80.

There are many threads about tyre types so if you have preferences you will find that your preferred tyres may be limited in size options.
 
The change in revs is very minor but since I have a spare RS final drive I might swap out the RT final drive IF maintenance requires it. Otherwise its not really worth doing.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 49,840 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

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