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1Back to top Go down   Car vs MC tires Empty Car vs MC tires Tue Apr 11, 2017 6:51 am

Crazy Frog

Crazy Frog
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Some people with big cruisers like Goldwings are installing car tires on their bike.
Is hat a good idea?
First this is illegal in some countries and your insurance may not cover you in case of crash.
82gl1100iWingman posted on goldwingfacts.com a very good article about design differences between car and motorcycle Rim/Tire.
Read the full post here


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Car vs MC tires Frog15Car vs MC tires Logo2101986 k75, 1985 K100rt, 1985 K100rt/EML GT2 sidecar, 1999 K1200lt/Hannigan Astro Sport sidecar.
    

2Back to top Go down   Car vs MC tires Empty Re: Car vs MC tires Tue Apr 11, 2017 7:24 am

David Nimrod

David Nimrod
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People used to use Citroen 2CV tire on their Outfits, many years ago.

Can't remember the exact details, but it seemed to work!


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What I'm out for is a good time
All the rest is Propaganda! Car vs MC tires 112350
    

3Back to top Go down   Car vs MC tires Empty Re: Car vs MC tires Tue Apr 11, 2017 7:38 am

Crazy Frog

Crazy Frog
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I am using the same type of tires on the outfit. Citroen 2cv or old VW beetle. They use the same type of tires (135 or 145 R15). 
The rims on the outfit are car types and not MC.
An outfit reacts a bit like a car. You don't lean (or very seldom). The sidecar frame doesn't have any flexible anchor points and is part of the bike's frame.
The problem is with people using the original MC rims/car tire on the back of a solo bike. This is quite common here in NA.


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Car vs MC tires Frog15Car vs MC tires Logo2101986 k75, 1985 K100rt, 1985 K100rt/EML GT2 sidecar, 1999 K1200lt/Hannigan Astro Sport sidecar.
    

4Back to top Go down   Car vs MC tires Empty Re: Car vs MC tires Tue Apr 11, 2017 7:43 am

Dai

Dai
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I always knew that car tyres wouldn't fit on motorcycle rims, but that's the first real technical explanation I've seen as to why. I also knew that the car tyre tread pattern wouldn't deform in the same way as a motorcycle tyre (logical, that!). Anyone who's ever fallen off the tread on an Avon Speedmaster MkII wouldn't go anywhere near a car tyre anyway. IMNSHO - damn stupid idea.


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1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

5Back to top Go down   Car vs MC tires Empty Re: Car vs MC tires Tue Apr 11, 2017 8:12 am

AL-58

AL-58
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There are 17" car tyres that will fit 17" bike wheels.

I've got 15" wheels front and rear on the sidecar, I have a 165/80-15 rear car tyre and though I can fit a car tyre on the front (typically 135, 145 or 145/65) I prefer a bike tyre, either 130/90-15 or 140/80-15.

A friend who had a Triumph Rocket 3(solo) used to run car tyres on the rear sometimes. In his case he was experimenting as many of his customers were doing it and he didnt want to comment without experiencing it himself.  He was a Triumph dealer, in the end he though they were fine.

Al


__________________________________________________
'08 F650GS (798cc)
'19 R1250RS

+ another boxer engined motorcycle and sidecar

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

Car vs MC tires K-dogs10
    

6Back to top Go down   Car vs MC tires Empty Re: Car vs MC tires Wed Apr 12, 2017 3:30 am

K75cster

K75cster
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Life time member
Yes its quite quirky really but the deal is its going to void insurance. The fact that they fit though not technically a true fit due to the different types of seat, hasn't stopped many from doing it and reporting they get phenomenal grip and distance on them.

All it takes is one instance and a policeman to note the tyre not fit for purpose, on a report and in most states here you are sunk. Then you run into trouble. Insurance wont pay out, the other party to the incident then claims you should not have been there in the first place, the whole thing escalates to a point where some would wonder if it was indeed a good idea.

60 year ago, it would be fine. I reckon many are too litigious these days. Disappointing isn't it.


__________________________________________________
Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

7Back to top Go down   Car vs MC tires Empty Re: Car vs MC tires Wed Apr 12, 2017 6:08 am

Dai

Dai
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Life time member
Al, I guess that you have car rims front and rear? Or just the rear? The guy I went to India with builds outfits. The last one he made he machined a Smart car wheel to fit an R100RS rear hub (or the other way round!). The rig runs car tyres on the sidecar and bike rear and a bike tyre at the front. UK legal, because he's using the correct rims.

From the little I understand, a bike tyre is better up front because it makes the steering easier. I can figure out why but I'm stymied when it comes to try and write it down!


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

8Back to top Go down   Car vs MC tires Empty Re: Car vs MC tires Wed Apr 12, 2017 6:34 am

92KK 84WW Olaf

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Dai wrote:Al, I guess that you have car rims front and rear? Or just the rear? The guy I went to India with builds outfits. The last one he made he machined a Smart car wheel to fit an R100RS rear hub (or the other way round!). The rig runs car tyres on the sidecar and bike rear and a bike tyre at the front. UK legal, because he's using the correct rims.

From the little I understand, a bike tyre is better up front because it makes the steering easier. I can figure out why but I'm stymied when it comes to try and write it down!

Smaller contact area on the road, harder to turn bigger contact area at low speeds, plus increase in rolling resistance?

Back when cars generally did not have power steering if you went up a tyre size as one would the first thing noted was heavier steering.


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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 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 48,061 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 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
    

9Back to top Go down   Car vs MC tires Empty Re: Car vs MC tires Tue Apr 18, 2017 2:29 am

AL-58

AL-58
Life time member
Life time member
Dai wrote:Al, I guess that you have car rims front and rear? Or just the rear? The guy I went to India with builds outfits. The last one he made he machined a Smart car wheel to fit an R100RS rear hub (or the other way round!). The rig runs car tyres on the sidecar and bike rear and a bike tyre at the front. UK legal, because he's using the correct rims.

From the little I understand, a bike tyre is better up front because it makes the steering easier. I can figure out why but I'm stymied when it comes to try and write it down!
The front and rear are custom 15" wheels, not car wheels on adapters. The rear always runs a car tyre between 135-165 wide.  155 is a nice size for width/height and slight reduction in gearing but is hard to get. 165 is the easy choice in Australia, 135 makes the engine rev too hard at speed and breaks away more easily under power (one tyre I had shredded rather than wore out)

The front wheel; I don't know whether it was made to car or bike specs.  Bike tyres always fit easily, a 135 or 145/80 car tyres fit easily, a 145/65-15 Smart car tyre is an absolute bitch and takes over 70psi to make it seat on the bead, never mind getting it off.

Smart car tyre: bigger contact patch, better brakes, sharp handling(low profile), better high speed.  Heavier steering, more inclined to head shake.

Bike tyre (130 or 140), smaller contact patch, brakes not as good more inclined to lock the front, less confident in wet conditions (ie must ride slower).  Lighter steering, very little head shake(due to narrower contact patch), I'm not even running a steering damper now.

With the state of my shoulders at the moment, the lighter steering wins the argument for me at the moment.  I did run a car tyre up front for many years and I do understand why you would, each is a compromise with their own strengths.

Al


__________________________________________________
'08 F650GS (798cc)
'19 R1250RS

+ another boxer engined motorcycle and sidecar

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

Car vs MC tires K-dogs10
    

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