Mis-aligned rear mech
larkim
Posts: 2,485
Rear mech is out of line with the chainline / rear cassette, mainly in the sense that the lower of the two small cogs in the rear derailleur is inboard of where it should be (and possibly rotated slightly askew too).
I'm presuming this is due to the mech assembly being whacked and bent, as I can't visibly see that the mech hanger itself is out of line. But given that a small variation in the mech hangar would be exaggerated at the furthest away point (the lower cog), how do I tell which part is out of line? Don't want to go bending / stressing the cog assembly if replacing the mech hanger would do the job, but conversely don't want to go changing the mech hanger if I don't need to.
I could of course buy loads of new parts, but I'm starting to get fed up with doing that!! (It's my son's bike (again!))
Matt
I'm presuming this is due to the mech assembly being whacked and bent, as I can't visibly see that the mech hanger itself is out of line. But given that a small variation in the mech hangar would be exaggerated at the furthest away point (the lower cog), how do I tell which part is out of line? Don't want to go bending / stressing the cog assembly if replacing the mech hanger would do the job, but conversely don't want to go changing the mech hanger if I don't need to.
I could of course buy loads of new parts, but I'm starting to get fed up with doing that!! (It's my son's bike (again!))
Matt
2015 Canyon Nerve AL 6.0 (son #1's)
2011 Specialized Hardrock Sport Disc (son #4s)
2013 Decathlon Triban 3 (red) (mine)
2019 Hoy Bonaly 26" Disc (son #2s)
2018 Voodoo Bizango (mine)
2018 Voodoo Maji (wife's)
2011 Specialized Hardrock Sport Disc (son #4s)
2013 Decathlon Triban 3 (red) (mine)
2019 Hoy Bonaly 26" Disc (son #2s)
2018 Voodoo Bizango (mine)
2018 Voodoo Maji (wife's)
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Comments
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Please take a photo from the rear showing the mech/hanger/frame alignement and post it for some sensible comments.
It could be a bent hanger or bent mech, the hanger is easy enough to check by removing and placing against a flat edge, depending on the bike it may also be the cheapest to fix!Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.0 -
Post pics, directly behind and from the side.0
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OK, will do this evening. Cheers.2015 Canyon Nerve AL 6.0 (son #1's)
2011 Specialized Hardrock Sport Disc (son #4s)
2013 Decathlon Triban 3 (red) (mine)
2019 Hoy Bonaly 26" Disc (son #2s)
2018 Voodoo Bizango (mine)
2018 Voodoo Maji (wife's)0 -
Couple of photos as promised:-
2015 Canyon Nerve AL 6.0 (son #1's)
2011 Specialized Hardrock Sport Disc (son #4s)
2013 Decathlon Triban 3 (red) (mine)
2019 Hoy Bonaly 26" Disc (son #2s)
2018 Voodoo Bizango (mine)
2018 Voodoo Maji (wife's)0 -
Hanger looks straight, If its out of line, it's a tiny amount, just use it as long as it shifts OK, looks more twisted slightly than out of line, probably caught on something.
Spesh?Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.0 -
Cheers. Yes; son's Hardrock 2011.2015 Canyon Nerve AL 6.0 (son #1's)
2011 Specialized Hardrock Sport Disc (son #4s)
2013 Decathlon Triban 3 (red) (mine)
2019 Hoy Bonaly 26" Disc (son #2s)
2018 Voodoo Bizango (mine)
2018 Voodoo Maji (wife's)0 -
Apart from all the red, the mech hanger is a dead giveaway!
If it shifts OK, just keep using it.Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.0
