Dark side?

Discussion in 'Hacks' started by gsuser, Apr 8, 2011.

  1. gsuser

    gsuser Amateur Explorer

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    Well almost, got the vintage kneeler project going on but as parts show up I also work on the car wheel adaptor for the GS.
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    Here is the tire, the wheel will be here after the 11th.
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    #1
  2. boxertwin

    boxertwin Long timer

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    I love to see a perfectly good round of metal turned into a bunch of shavings.
    Great job.
    Is that an RF-30 mill?
    #2
  3. gsuser

    gsuser Amateur Explorer

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    I am pretty good at turning big parts into unusable little parts. The mill is an Enco and I believe is the typical rf30 copy.
    #3
  4. Boondox

    Boondox Travels With Barley

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    Just curious why you went with a snow tire out there in Nevada. They wear pretty fast in heat. Not that I'd know much about heat back here in Vermont. :evil
    #4
  5. gsuser

    gsuser Amateur Explorer

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    Well it happened to fit and be available from my supplier. One of the things I was looking for was a smaller diameter and would match the wheel width I was going to use. It is a cool looking tire and that was another factor. As far as a snow tire I do ride year round out here and on dirt /gravel roads so I figured I would give it a try. If it gets the same mileage as my ME880 it is still cheaper per mile and I think it will go at least twice as far as the Metzler I am golden. There are a lot of tires out there and I need to build another adaptor for my buddies 1100GS and he will probably be using some other tire.
    #5
  6. boxertwin

    boxertwin Long timer

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    I thought it looked familiar. Mine gets most of the credit for building my recent outfit. Now I need one of those spinny machines so I too can turn a $150 piece of aluminum into a $.25 bucket of recyclables.
    #6
  7. Boondox

    Boondox Travels With Barley

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    You'll get plenty of mileage out of it compared to an MC tire. I'm kinda envious. I never thought of checking snow tire sizes and since we get a bit of the white stuff I really could have used one. Instead I went with a BFG Radial TA in 155/80R15, a decent warm weather tire. But a snow tire woulda been the cat's meow.
    #7
  8. gsuser

    gsuser Amateur Explorer

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    The snow tires always seemed to be the first ones to pop up in a search and they seem to come in lower profiles and diameter was important to me. The 1150 GS is geared pretty tall so a smaller tire just seems the way to go.
    #8
  9. chrispg

    chrispg n00b

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    orygun
    awsome idea I like it :lurk

    Attached Files:

    #9
  10. ClearwaterBMW

    ClearwaterBMW The Examiner

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    awesome-looking rig
    am i seeing things or is something "out of alignment" here:
    (just wondering... sure i'm wrong, of course)


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    #10
  11. gsuser

    gsuser Amateur Explorer

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    The tire is just setting behind the bike.
    #11
  12. ClearwaterBMW

    ClearwaterBMW The Examiner

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    oh
    yikes...
    sorry
    nevermind.... :D
    but, thanks for the reply
    #12
  13. gsuser

    gsuser Amateur Explorer

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    Made some more chips today, turned all the diameters and faces, flanges are made and all the holes are drilled.
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    #13
  14. boxertwin

    boxertwin Long timer

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    That's the prettiest thing I've seen all day.
    #14
  15. gsuser

    gsuser Amateur Explorer

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    Thanks guys. This piece is 6061, it did not have the T6 label but it should be plenty strong. I still have to drill the counter bores for the bolts to the final drive and finish the back of the car wheel side for the wheel studs.
    #15
  16. granratfisher

    granratfisher Been here awhile

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    I want one. Let me know when it is finished. :DJoe
    #16
  17. gsuser

    gsuser Amateur Explorer

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    Made a little progress on both projects, sprayed some primer on the kneeler and got the wheel adaptor ready for wheel studs and setup to do the counter bore for the BMW bolts to the final drive. I am waiting for some countersinks from McMaster & Carr.
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    #17
  18. gsuser

    gsuser Amateur Explorer

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    I get a lot of my material from a dealer that buys a lot of surplus metals and as a result he sells the materials at scrap prices, aluminum is $1.40 a pound and the piece I started with was 28 pounds.
    #18
  19. gsuser

    gsuser Amateur Explorer

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    So, since the GS is getting a car tire on the rear I think I might put one of these Dunlop K81 on the front. I think a 4.10 x 19 should fit nicely in the front.

    Attached Files:

    #19
  20. BMWzenrider

    BMWzenrider The Road Scholar

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    CheeseHead Land...
    You never said what size your new wheel and tire are?

    I have been gathering 15" car tire size data on a spreadsheet for my sidecar rig and could give you some suggestions for other tires.

    The Metzler ME880 in your stock 150/70-17 tire size is listed as 667mm max diameter and 149mm max width.
    In english units that is 26.26" diameter and 5.89" wide.
    That is a bit larger than the size of the more customary Tourance tire in that size which is listed as only 650mm/25.6" diameter.
    That makes the ME880 2.6% larger diameter, meaning it is that much higher geared with that tire installed. Even 2-3% difference in gearing can be felt with a sidecar attached, believe me.

    Based upon my years of sidecar riding, I have found that anywhere from 10-15% gearing reduction can be a good thing with a sidecar attached.
    Using that as a guide, I would suggest looking for a tire in the range of 23.03"-21.76" diameter.
    If you are using a 4x15 wheel, which is common for sidecar conversions, here are a couple of tires that I can recommend:

    145/65R15 - 22.4" dia. - Continental EcoContact EP all season
    155/60R15 - 22.3" dia. - ContiProContact all season
    165/60R15 - 22.8" dia. - ContiProContact all season
    175/55R15 - 22.6" dia. - Hankook Ventus V4 ES H105 high-performance all season

    Here is a great place to do some reasearch on different tire sizes and options:
    http://www.tirerack.com/tires/sizes/results.jsp?diameter=15
    #20