G/S front wheel in a GS front end

Discussion in 'Airheads' started by Beemerguru, Nov 16, 2010.

  1. Beemerguru

    Beemerguru Beemerguru...G/S guy

    Joined:
    Nov 7, 2006
    Oddometer:
    1,205
    Location:
    Redwood City, CA
    Just had a brain fart and wondered if anyone has tried this before? Building a couple more R80G/S and was noodling about a different way to upgrade the front end.

    I know the arguments about a tube vs tubeless etc, but this keeps it consistent with tubes on both ends.

    Was thinking about making a reducer so the 17mm G/S axle would fit the GS holes and doing the same with the brake caliper setup so they would match.

    I have 5 G/S front wheels and a couple GS front ends. So I get a tube 21" front wheel with the heavier GS tube setup for the cost of a couple reducers.

    OK....go
    #1
  2. espressodrinker

    espressodrinker Cape Town Wanderer

    Joined:
    Mar 31, 2008
    Oddometer:
    208
    I upgraded my G/S front to GS forks and tripples. Then wondered about the wheel :(: :(: :(: duh!
    I wanted to keep the big diameter axle from the GS............so I
    Turned out the inner part of the hub on a lathe ( just about where the bolts go to hold the brake carrier.
    Then made up 2 bearing carrier disks in aluminium that bolted on each side of the wheel, using the brake disk bolts.
    I should probably upload a few pictures now, but I don't have any.
    Bend my arm and I will.
    #2
  3. Beemerguru

    Beemerguru Beemerguru...G/S guy

    Joined:
    Nov 7, 2006
    Oddometer:
    1,205
    Location:
    Redwood City, CA
    Mild bent sent...bigger one coming if response lacking :lol3
    #3
  4. squish

    squish Out of the office.

    Joined:
    Dec 4, 2003
    Oddometer:
    7,171
    Location:
    Where the Ghetto meets the sea.
    It seems to me that if you are going to go to the trouble of getting a G/S wheel to fit that it would be just as easy to get something like a Talon hub and modern rim to fit... Most likely it would be cheaper and stronger to boot.
    #4
  5. Rucksta

    Rucksta SS Blowhard

    Joined:
    Oct 26, 2008
    Oddometer:
    2,724
    Location:
    Gold Coast
    Squish

    After going to all the trouble to fit the std G/S wheel to my USD forks all for the sake of having it look like a BMW I wondered the same thing, wouldn't it be easier, cheaper, stronger & lighter to go Talon / Excel.

    My 40 spoke hub and akront rim is still nice and round.
    Mates with the Talon/Excel combo are riding various polygons that could best be described as anything but a circle after having travelled less than 1% the distance my old 40 spoke wheel has done.

    I thought the Talon/Excell combo would be heaps lighter and recently had the chance to compare a Talon/Excel with heavy duty stainless spokes to my similar spec BMW hub. The BMW was heavier by not much, probably about the weight of 6 spokes.

    If you had to buy a new G/S front wheel complete then the Talon/Excel would certainly be cheaper
    #5
  6. Beemerguru

    Beemerguru Beemerguru...G/S guy

    Joined:
    Nov 7, 2006
    Oddometer:
    1,205
    Location:
    Redwood City, CA
    Actually my master machinist just came up with another idea...

    Mill a new axle and a reducing collar for the other fork lower. That means the standard G/S wheel can be used with the standard GS forks.
    #6
  7. zenben

    zenben all roads are one

    Joined:
    Feb 27, 2007
    Oddometer:
    595
    Location:
    Portland Oregon
    That's what I'd do, though I'd turn the axle rather than mill it.
    #7
  8. espressodrinker

    espressodrinker Cape Town Wanderer

    Joined:
    Mar 31, 2008
    Oddometer:
    208
    I would want to keep the big diameter axle if I could. I found that if you upgrade the front brake the forks want to twist, even with a good fork brace. A big axle prevents twist where it starts. All newer bikes have huge axles.
    #8
  9. Beemerguru

    Beemerguru Beemerguru...G/S guy

    Joined:
    Nov 7, 2006
    Oddometer:
    1,205
    Location:
    Redwood City, CA
    I'm waiting for Expressodrinker to find his specs for adapting the G/S wheel for the larger axle (that's a hint)

    Adding a Harrison 6 piston caliper so yes, more forces at work. Between the beefier triple, tubes, and brace, I know it will be a step up from stock but not close to the results from swapping out for a regular dirt bike front end.

    Already have extra wheels so a new axle and collar make the best sense economically...compromise
    #9
  10. airheadpilot

    airheadpilot Le Poulet du D├ęsert

    Joined:
    Dec 8, 2005
    Oddometer:
    286
    Location:
    near San Francisco
    Or, with a little patience on eBay, you can pick up a complete front end from a late-model Japanese dirt bike (USD forks, billet triple clamps, wheel, caliper, axle, etc.) for less than $300, plus the cost to have the forks shortened and set-up properly and have your master machinist press the BMW steering stem into the dirt bike triples. You can then sell that R100GS front end and a couple of those G/S wheels and still come out with money in your pocket. Go ahead, ask me how I know...

    adh

    #10
  11. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

    Joined:
    Nov 16, 2006
    Oddometer:
    5,457
    Location:
    Bowling Green, Ky
    Greg, I think the big GS axle makes a huge difference over the thin G/S axle.

    [​IMG]


    [​IMG]

    I'm sure this isn't the route you want to go, but a GS hub, relaced to a Akront rim, or in my case an Excell rim. Had Woody's lace up the rim, used larger butted spokes at the hub and then a standard threaded spoke at the rim. Really nice setup.

    http://www.advrider.com/forums/showthread.php?t=546963&page=5


    BTW- that harrison is nice, I ended up going w/ a larger MC (14mm I believe) than the stock 12mm G/S, better lever feel.
    #11
  12. Beemerguru

    Beemerguru Beemerguru...G/S guy

    Joined:
    Nov 7, 2006
    Oddometer:
    1,205
    Location:
    Redwood City, CA
    Yeah..I've already been down this road with this bike...I just keep looking at the stack of G/S wheels and wonder how to keep both ends the same..tubes.

    PS: this thing is a blast to ride !!!!

    My metal guy says the billet stock will be as strong or stronger than the GS axle since it won't be hollow.

    This won't be a "Copper Canyon" bike but for the street and dirt roads..should be fine.

    Attached Files:

    #12
  13. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

    Joined:
    Nov 16, 2006
    Oddometer:
    5,457
    Location:
    Bowling Green, Ky
    I'm running tubes both front and rear. I hated the idea of using the GS rim (tubeless) w/ the tube rear. Yeah could have put a tube in the front GS rim, but two different type rims to me is a botch job.
    #13
  14. espressodrinker

    espressodrinker Cape Town Wanderer

    Joined:
    Mar 31, 2008
    Oddometer:
    208
    Sorry, but I didn't keep a record of what I was doing as it progressed. Hope this makes it clear. If you need one, I could do some kind of a sketch of what it looks like in cross section.
    The bike is still a bit dirty after the last mud ride :D

    Attached Files:

    #14
  15. espressodrinker

    espressodrinker Cape Town Wanderer

    Joined:
    Mar 31, 2008
    Oddometer:
    208
    Another

    Attached Files:

    #15
  16. magi

    magi Adventurer

    Joined:
    Jun 27, 2008
    Oddometer:
    53
    #16
  17. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

    Joined:
    Nov 16, 2006
    Oddometer:
    5,457
    Location:
    Bowling Green, Ky
    I can help you get a four piston Brembo, but not a Harrison 6 pot.
    #17
  18. DK Dan

    DK Dan Been here awhile

    Joined:
    Jan 14, 2013
    Oddometer:
    314
    Location:
    Denmark
    Hi Greg,

    Just got hold of a GS fork and I'm very interested in hearing if you went for this solution? And if so could you share the details?
    #18
  19. Beemerguru

    Beemerguru Beemerguru...G/S guy

    Joined:
    Nov 7, 2006
    Oddometer:
    1,205
    Location:
    Redwood City, CA
    Actually, I did.

    R100GS front end on one of the G/Ss..and have a billet axle, spacer and insert made. It positions the wheel exactly where I wanted it, the Harrison brake caliper mounts just right, and the axle isn't going anywhere when everything is clamped in.

    So I still have tubes on both ends with a stronger front end.
    #19
  20. DK Dan

    DK Dan Been here awhile

    Joined:
    Jan 14, 2013
    Oddometer:
    314
    Location:
    Denmark
    Thanks a lot for the response Greg. Do you have any photos of your setup, the individual parts or even better some drawings with measurements?

    Also I'm a bit confused about the term "billet axle". Does this mean "solid axle"? (as opposed to the hollow GS axle).
    #20