Bent hanger, replace, straighten or adjust?

gloomyandy

Following me sliding down the road this morning on black ice I now have a slightly bent hanger on my Planet x pro carbon. Basically the gears are off by one so I can't select the smallest cog and if I shift to the biggest cog position the rear mech is just hitting the spokes.

So what should I do to fix it?
* New rear hanger (anyone know where to get one what part no. etc.).
* Straighten it (what's the best way to do this on a carbon frame).
* Adjust the limit screws to make it work (not sure if I could do this or not, but given it is only one gear out, it may be possible).

Any other suggestions?

Thanks

Andy

sungod

don't ride it as is, no point risking the rear mech snagging the spokes by accident

if the hanger is only slightly bent, adjust it - ideally using an alignment tool, if you haven't got one either buy/borrow one or get the lbs to do it, it's a simple task

if it's badly bent, replace it

with a bent hanger it is unlikely that you will be able to adjust for decent shifting across the whole cassette

Wirral_paul

For £15 i'd be inclined to replace it. I do have the correct tool to align the hanger but i'd be concerned about it being weakened by a crash and restraightening. If it fails in the future then it could get expensive - i've seen frames and wheels damaged by a sheared off rear mech

gloomyandy

Hi Folks,
thanks for the info. I agree I don't fancy having the rear mech end up in the spokes. So I've ordered a replacement hanger from Planet-X. Will I need to align it when I fit it, or should it be aligned properly be default? Even with a proper tool the thought of heaving on a bar attached to the dropout that in turn is attached to a carbon frame makes me a little nervous!

Andy

mrdsgs

Really no heaving involved. The proper tool would do the job with rear wheel in so the rear carbon seat and chain stays are effectively braced and held in place. Most modern hangers are sacrificial alloy. I would fit the new hanger if it is already ordered but if the indexing is still off I would check alignment then.You might have bent the rear mech pulley cage rather than or as well as the mech hanger so you might find indexing is no better.

wishitwasallflat

I replaced one on my Spesh Sectuer and it was fine straight off but from reading previous posts on here it seems that is not always the case. Why not fit the new one and hopefully it will be fine but adjust if needed?

keef66

Just buy a replacement hanger and fit it. Make sure the mating faces are spotlessly clean and that you torque up the mounting screws properly.

Last week my CR1 just took a sideways dive onto the garage floor. Once I'd stopped effing and blinding I could see straight away the rear mech was scraped and no longer sitting vertically beneath the sprockets, so I just went online and ordered a replacement hanger. No point in risking trashing a wheel or the frame should a weakened (straightened) hanger fail and put the mech into the spokes.

extrusion

What do you do if the original hanger has been tightened by tiny little screws so much that you can't get them off and have rounded the inner hex? Just asking ...

keef66

extrusion wrote:

What do you do if the original hanger has been tightened by tiny little screws so much that you can't get them off and have rounded the inner hex? Just asking ...

Then you need a small drill bit and a screw / stud extractor. And a very steady hand. :shock:

I much prefer the ones that attach using a standard chainring bolt.

(I must get on and put the new one on the CR1. That looks like it uses the tiny hex screws of which you speak)