Interchangeable Fork Lowers?

Discussion in 'Airheads' started by Sabre170, Nov 10, 2012.

  1. Sabre170

    Sabre170 Been here awhile

    Joined:
    Nov 9, 2012
    Oddometer:
    857
    Location:
    Dallas, TX
    How interchangeable are fork lowers between different airhead models?

    I've got a '78 R100/7 and am looking to put a set of r65LS fork lowers on my 100/7 forks (maintaining the rest of the fork assembly 100/7 parts.....just swapping the fork lowers.

    Can I do this or is there a compatability issue?
    #1
  2. mark1305

    mark1305 Old Enough To Know Better

    Joined:
    Feb 7, 2005
    Oddometer:
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    Location:
    Merritt Island, FL
    The easiest way to check a specific part for compatibility is to look up each respective part on a fiche such as Max BMW's.

    Having said that, I know that the R65 LS lowers are the same part numbers as the lowers on my R80 ST. (I have a set hanging on the garage wall). And the caliper lugs are for Brembo calipers. If your bike has ATE calipers, you may have a mismatch - not sure since I never dealt with ATE brakes.
    #2
  3. Sabre170

    Sabre170 Been here awhile

    Joined:
    Nov 9, 2012
    Oddometer:
    857
    Location:
    Dallas, TX
    Yeah, mine has ATE calipers. I am pretty sure i can't interchange them. Unless someone can tell me I can, Im not going to take the gamble.
    #3
  4. Voltaire

    Voltaire Titanium and Ceramic Hipster

    Joined:
    Jun 4, 2011
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    2,042
    Location:
    Auckland,New Zealand
    I put an ATE front end on my racer only to find one slider was bent....had a set of Brembo forks from a later bike and used the slider and internals. only mod was to drill out the bottom plate of the ATE lowers to accept the larger 8mm bolt ( from memory)
    You want the opposite so the lower fixing bolt may be too small.

    Personally I like the ATES, 13 mm bar m/c, stainless hoses and cast iron discs haul up my racer pretty damn good.
    Sold of the Brembos....pfft.
    The Ractech kit and linear springs make for a good ride...but saying that its not a road bike.

    Also have an R65 and the fork lowers have the axle in the centre and I think they might be a bit shorter too.
    #4