BMW K bikes (Bricks)

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1Back to top Go down   Tire size question Empty Tire size question on Tue Jun 16, 2020 7:46 am

yamaguzzi

yamaguzzi
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Is there any advantage or disadvantage  to mounting a 130 /80 /17 on the rear of a K100rs as opposed to mounting a 130/90/17 on it ?


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1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://motoguzzi850t.blogspot.com/
    

2Back to top Go down   Tire size question Empty Re: Tire size question on Tue Jun 16, 2020 9:32 am

Laitch

Laitch
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@yamaguzzi wrote:Is there any advantage or disadvantage  to mounting a 130 /80 /17 on the rear of a K100rs as opposed to mounting a 130/90/17 on it ?
If you're comparing bias-belted tires, an 80 on the rear will stiffen the ride.


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1995 K75 77,000 miles
Tire size question Usa-lo10
    

3Back to top Go down   Tire size question Empty Re: Tire size question on Tue Jun 16, 2020 9:36 am

yamaguzzi

yamaguzzi
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Well, that is ok. You see,I run Avons and I can't get the 90 right now because of this damn covid crap.All the online tire places are sold out.I want to keep a matched set on the bike so I can get the 80 and do that.The front tire is still really good .They are a year and a couple months old so I only need a rear.I can live with a stiff ride .


__________________________________________________
1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://motoguzzi850t.blogspot.com/
    

4Back to top Go down   Tire size question Empty Re: Tire size question on Tue Jun 16, 2020 10:30 am

Laitch

Laitch
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Life time member
@yamaguzzi wrote:Well, that is ok. You see,I run Avons . . .
Which Avon?


__________________________________________________
1995 K75 77,000 miles
Tire size question Usa-lo10
    

5Back to top Go down   Tire size question Empty Re: Tire size question on Tue Jun 16, 2020 10:49 am

yamaguzzi

yamaguzzi
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Platinum member
Road rider


__________________________________________________
1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://motoguzzi850t.blogspot.com/
    

6Back to top Go down   Tire size question Empty Re: Tire size question on Tue Jun 16, 2020 11:37 am

92KK 84WW Olaf

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I took to 140/70/17 and very happy using that size, Battlax BT45.

On my K1100LT I have 160/60/18 on the RS wheel and also 140/70/17 on the LT wheel and find the turn in much better on the 140/70/17 LT set up.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska 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 105,200 miles
1983 K100RS 0011171 Fricka 606 29,495 miles Damn K Pox Its a Bat outta Hell Now 36,188  miles
    

7Back to top Go down   Tire size question Empty Re: Tire size question on Tue Jun 16, 2020 8:21 pm

cycleman

cycleman
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Going from a 90 series to an 80 series will affect gearing and your speedo. Smaller overall diameter. Other than that as long as they will both fit on the same rim dimensions it will work. Not sure if the smaller diameter would cause you any clearance issues on the bike.

    

8Back to top Go down   Tire size question Empty Re: Tire size question on Wed Jun 17, 2020 7:30 am

92KK 84WW Olaf

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Having run 130 and 140 profiles in 70 and 80 on my K100RT over 53,000 miles to be honest you are not going to notice the difference very much. The 70 does have a slightly low er speed rating in BT45 and not sure about the Avons but both are good for the K bikes.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska 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 105,200 miles
1983 K100RS 0011171 Fricka 606 29,495 miles Damn K Pox Its a Bat outta Hell Now 36,188  miles
    

9Back to top Go down   Tire size question Empty Re: Tire size question on Wed Jun 17, 2020 10:05 am

cycleman

cycleman
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A couple of other areas that it likely will impact is seat height and the effort required to get the bike on the center stand.

    

10Back to top Go down   Tire size question Empty Re: Tire size question on Wed Jun 17, 2020 12:56 pm

BobT

BobT
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13mm lower at the axle should make about 9mm lower seat. A pocket full of small change would make that much difference.  Very Happy

    

11Back to top Go down   Tire size question Empty Re: Tire size question on Thu Jun 18, 2020 5:32 am

92KK 84WW Olaf

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@cycleman wrote:A couple of other areas that it likely will impact is seat height and the effort required to get the bike on the center stand.
I can vouch for that....


__________________________________________________
1992 K100LT 0193214 Bertha Alaska 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 105,200 miles
1983 K100RS 0011171 Fricka 606 29,495 miles Damn K Pox Its a Bat outta Hell Now 36,188  miles
    

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