Viewing 29 posts - 1 through 29 (of 29 total)
  • crank/frame compatability issues.
  • tracknicko
    Free Member

    Right.

    Dolan cx frame, two ring truvativ road crankset (gxp)

    Without spacers cranks hit chainstays. With spacers bearings bind as axle isn’t long enough.

    Axle is built into cranks so can’t get a longer one like you would in the days of Isis!

    So what options do I have?

    Help!

    tracknicko
    Free Member

    Come on team! Current ideas…

    Shave 3mm off crank arm end…

    Create ‘custom’ dents in chainstay for crank to glide through…

    cynic-al
    Free Member

    you need to change the crank or frame, that simple.

    tracknicko
    Free Member

    Great! Anyone know of amy cheap road cranksets with a wider q factor then?

    cynic-al
    Free Member

    lemme guess…road cranks and mtb or other non road frame?

    andyl
    Free Member

    lemme guess…road cranks and mtb or other non road frame?

    Dolan CX frame ^^^^

    Are you using the correct bottom bracket? Do both arms hit?

    Maybe it needs to be a CX crankset? (never had a road or CX bike so no idea)

    tracknicko
    Free Member

    Yeh the bb doesn’t change on gpx as its the axle length that defines width.

    Cx SHOULD be road setup. Both arms hit. Properly hit.

    oneoneoneone
    Free Member

    chain reaction are selling raceface cadence cranks for £50.

    i was looking at them for my cx frame. sell the outer ring

    oneoneoneone
    Free Member

    measure the axle, i have a truvative chain set on my crosslight. i would be happy to check the axle length on mine

    tracknicko
    Free Member

    thanks mate but i think its the chainstay width that’s the issue!

    oneoneoneone
    Free Member

    really! i have never heard of that issue before. unless as stated above, you have a narrow road chainset

    shortcut
    Full Member

    It will be designed around cx specific cranks.

    So nothing is wrong aside for crank choice.

    tracknicko
    Free Member

    really? so a shimano 105 CX crankset (for example) has a wider bb/axle setup than the road version you reckon?

    oneoneoneone
    Free Member

    I don’t think it does, its called a CX chainset because of the chain rings.

    do you have the correct GPX BB? I know they are different from a normal HT11 BB

    tracknicko
    Free Member

    no i don’t think it does either…

    gxp bb is correct. as i said, the bb has no bearing (excuse pun) on crank axle length…

    oneoneoneone
    Free Member

    as the tyre max width is a 23mm i dont think you chain stays will be that wide!

    also a 23mm tyre is tiny! EDIT 23CM is massive

    are you using 180 cranks?

    tracknicko
    Free Member

    ummm, you know that the crank doesn’t cross the chainstay at the same point as the tyre clearance happens right?

    23mm is indeed tiny, i reckon you’d get about a 50mm tyre in there, so lets ignore that spec sheet!

    cranks are 175 or 172.5

    oneoneoneone
    Free Member

    but the chain stays will flair out to fit the tyre.

    maybe the rear end is stretched out? whats the rear wheel axle width?

    does it touch on both sides?

    tracknicko
    Free Member

    this is gonna end up with me taking a picture.

    chainstays DON’T flair out to fit tyre. they are going from hub width at axle to bb width at bb in a pretty straight line.

    it does indeed touch at both sides. needs about 2-3mm extra on each side…

    rear axle is standard road width, not stretched or owt.

    all is as normal, only the chainstays don’t have that slight dink in them you used to get, or snake in like you sometimes see, and thus…. cranks hit.

    oneoneoneone
    Free Member

    ah ok! now makes sense!

    is it a brand new frame? if it is i would be calling dolan and see if they have sold you a duff frame.

    i cant remember the last time i a saw a frame with straight chainstays.

    in this case it would be the chain stays

    tracknicko
    Free Member

    sadly tis an ebay purchase… SH.

    mtb cranks will fit… but chainline is shite and rings are wrong.

    ho hum.

    cynic-al
    Free Member

    Sounds like an issue with the frame, AFAIK there’s no separate standard for cx frames, so they “should” comply with road cranks?

    Never liked Dolan anyway, just badged Tawianese tat innit?

    tracknicko
    Free Member

    indeed. and thus cheap.

    tragically i guess they don’t have any sram road cranks in taiwan..

    cynic-al
    Free Member

    You could measure the inner Q factor on your cranks and see if they are narrow cf others.

    tracknicko
    Free Member

    see this one? (bit of a touring build)

    has little er… ‘dinks’ where crank passes.

    well mine doesnt.

    home made dinks likely to trash a frame? i do love getting the hammer out!

    oneoneoneone
    Free Member

    ask dolan. they may be able to sort you out with a frame swap or at least guide you towards he correct arrangement.

    tracknicko
    Free Member

    a frame swap? for a second hand bike?

    cynic-al
    Free Member

    That’s what I thought…Dolan would likely say the same.

    tracknicko
    Free Member

    hmmm. i feel a bit like i am where i started with this thread.

Viewing 29 posts - 1 through 29 (of 29 total)

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