Darkside car tires

Discussion in 'Hacks' started by Dirtyairhead, Oct 5, 2017.

  1. Dirtyairhead

    Dirtyairhead Adventurer

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    20170925_171534.jpg I'm putting together a sidecar on my 1992 r100gs with a 17 inch tubeless rim. See the m102s install. Yes that's the way to my house.

    I'm interested in learning about a car tire to use for the 17 inch drive tire. I use a Cycle Hill tire changer . I do all the work myself so iInternet suppliers are fine with me.

    My purpose is to get better wear for less money.

    I'm cheap but won't trade a low price to sacrifice safety.
    I welcome your comments and suggestions .
    Thanks
    John
    #1
  2. DRONE

    DRONE Dog Chauffeur

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    17-inch tubeless rim. OK. But, what is the width of the rim? If you don't know, what size moto tire do you run?
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  3. DRONE

    DRONE Dog Chauffeur

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    I just looked at the fiche. OEM spoke wheel is 2-1/2 inches wide. 2.5x17 is not really car tire friendly.
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  4. Dirtyairhead

    Dirtyairhead Adventurer

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    Yes I was a bit casual to have left that out 2.5 x 17 tubeless I have been riding stock tires 130/80. I don't mind changing tires and not willing to change rims. I was just hopping. Thanks for looking. John
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  5. davebig

    davebig Another Angry Hun !

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    Wow DRONE's post sent me to the fiche also 2.5 inches in that period BMW really expected you to ride a GS off road ! I would look to try an r1100/50 rear wheel if it will fit in the triangle, you'd be set for a 175/55/17 . Otherwise it's adapt a 15" auto wheel.
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  6. davebig

    davebig Another Angry Hun !

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  7. rg sw wa.

    rg sw wa. Long timer

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    I have not had fun with a pusher car tire on gravel. Went back to a Heidenau K60 Scout tire for where I ride. My 2ct’s.
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  8. DRONE

    DRONE Dog Chauffeur

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    @Dirtyairhead, If you stick with the stock rim, I believe you'd be perfectly safe bumping up to a 140/70 and, if you did, my first choice in that size would be the bias-ply Bridgestone Battlax BT-45. Long wearing tire. And the wider contact patch should give you a little more longevity. But it's also available in 130/80.
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  9. Dirtyairhead

    Dirtyairhead Adventurer

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    Thanks everyone. If I get a smaller diameter rim laced to the hub it could open more tire choices? and a side benefit of lower final drive gearing. Could it be an alternative to buying 37/11 gears? Now I'm thinking of a snow tire pusher and my normal mc dual sports front and side. Sand and Gravel is normal for me. Simplicity is important to me and if this gets to much I'll just stay with stock and buy tires. Some of us friends went together on a tire changer and it stays in my garage. Beats using 2x4s on the floor.
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  10. cycleman2

    cycleman2 Been here awhile

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    Answer is yes to most of your questions. Seeing as you already have the spoked GS wheels that would be the way for you to go. Likely the cheapest. Seeing as you already have 34/11 gearing you will get it a bit lower, but it really would depend on the final diameter of the tire you install. Should be able to calculate it out. Folks like me with the cast mag wheels, go and buy the spoked GS wheels and lace up a car rim for just that purpose, if that's what they want. I know there is a couple of car tires that will fit that set up. It would be worth costing out the difference between the rim or a spacer that would allow you to run a car rim. Just a thought.

    Once you go this route you will have to realign the car.
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  11. airheadDan

    airheadDan Adventurer

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    I believe that the OP is asking about a car tire for an airhead GS with a drum rear brake. While not impossible to adapt a cast wheel it would involve considerably more than an adapter. The easiest solution would be to lace up a 15" car wheel to the stock hub. You could play with the offset to allow for tire clearance although then you might run into exhaust and fender clearance problems
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  12. usgser

    usgser Long timer

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    Don't know of a car tire that will safely work on a 2.5x17 rim? Eating pusher tires on outfits is just part of the deal. Regardless of bike/tub brands pusher tires wear fast on pavement...sorry. The rear(pusher) doesn't lean on curves. Instead it scrubs. A dedicated built for sidecar outfits tire is a flat profile rather than round for a two wheeler. It'll stick better on curves Round profile tires will eventually flatten out but by the time they do the tread is pretty much gone. Heindenau(sp?) makes some good sidecar tires at a price that wear decent. I run Duro 308's or307's(prefer 307 semi-knobbie) and depending on dirt-vs-pavement time spent get about 3,000-5,000 miles out of a pusher. They are pretty cheap for mc tires but they are dedicated sidecar tires with the proper profile and weight rating. Avon builds some dedicated street tread hack tires but pretty expensive. I've "heard" they get better wear mileage than others but because of cost I haven't tried them. Did I mention wearing out and replacing pusher tires on an outfit is just part of the deal piloting a hack? Good luck on your search.
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  13. walkingbear

    walkingbear Lets Play Chicken!

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    37/11 final drive on a paralever really don't exist . I think if you go to a small first in the transmission you will get the benifit of the 37/11 plus you can check your trans out. A tall 5th would be great also.
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  14. Dirtyairhead

    Dirtyairhead Adventurer

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    Lots of different choices. A stock rear hub and new rim sounds good, but so is strictly stock rim and opportunities for frequently testing new tires (KISS).

    I think we'll just have to use it for a while to figure out what we want. Too new to even know what that might be. As I work on the rig pictures will continue.
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  15. cycleman2

    cycleman2 Been here awhile

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    If you do some searching, you'll find some that have put 37/11 gearing in paralever rear drives. May have been custom made, as I've just read their posts, not the specifics on how they made it happen. The gearing out of a r850 would be lower as well but can't recall the gear ratio. With the first generation oilheads, you did have some options, but the 1200 series, other than an optional police rear drive out of Europe (3/1 ) not much out there, but then again with the power, likely not an issue.

    Gearing is more of a help on low powered rigs like the airheads, and other smaller displacement bikes. Drive shafts have their good points but much harder/more expensive to mess around with gearing.
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  16. walkingbear

    walkingbear Lets Play Chicken!

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    I have a 1150gs with an 850 rear drive. Sometimes it is really a pain as 1st gear only gets you to 18 mph before the shift point. I might change back to a non abs 1150 or 1100 drive .
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  17. davebig

    davebig Another Angry Hun !

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    If you drive it off road that's the way it should be, if your around town start in 2nd. How tall of a rear tire are you running ?
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  18. FR700

    FR700 Heckler ™©®

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    We'll make a truck driver outta you yet.
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  19. walkingbear

    walkingbear Lets Play Chicken!

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    165 x . 15 .
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  20. FR700

    FR700 Heckler ™©®

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    ...and the aspect ratio of said tire would be?

    Coz that'll tell us the important part.
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