Redline 401 Crank Arm - Cracked Pinch Bolt

[BossHogg]

Hi all,

I've got this set of single pinch Redline 401's. Bit of rust here and there but pretty good nick overall.........well apart from this crack in the non-drive arm.



Anyone know if this damage can be fixed up and made good enough to ride on again?  The crack looks to be in a pretty tricky spot alright.  Could be some issues with any repairs being put under tension in that spot right there, i dunno.

Any expert opinions appreciated.

Cheers - Jim 


 

[CD17]

Im sure that could be fixed if you know a good tig wilder, but it would take a bit of work to get it looking right 

Or even a good tig welder 

[billstup]

I recon it could be repaired for show purposes, but I wouldn`t like to ride on them 

[bmx xxx]

i recon super super glue would do, well worth repairing though, good luck

[sawzall]

that should repair ok,the crack would need to be veed out then tig welded,then the thread would need to be re-tapped

[mark 2]

Be careful with a re-tap if it get's drilled again for the thread you'd lose too much of the original metal and then have to go up a size and knob about with different hardware for that side. Try a little weld and get it filed and polished out then a rechrome.

[TwoBobRob]

No tapping there surely?   It must be a clearance hole....  Tapped thread is on t'other bit   


As for the repair, stick it in the post to Fuzzynod, have his mate repair it, then I'd say ride on it no worries 

[sawzall]

just noticed it was on the non thread side

[mark 2]

yes, well spotted

[SaMAlex]

I had a crank arm rewelded (not a 401). The weld was spot on but the heat distorted the spindle boss and it didnt fit over the spindle!! Just a little something to watch out for.

[RATTY]

Before you go to the expense of welding and rechroming, there is usually a good supply of orphan arms on ebay, might be a cheaper route

[SaMAlex]

there is usually a good supply of orphan arms on ebay

Does this thread, and this comment, answer the "which is better, flights or profiles?" Question?

[Bob_Acid]

Aye, does a bit don't it?

[BossHogg]

Cheers fella's,

Plenty of food for thought there 

Any ideas on cost of repair and a re-chrome vs cost of an orphan?

I was lookin to use the cranks for a rider but if there's any strength issues, maybe not.

Might just be best looking for another arm what with the cost for repair and re-chrome, and if the thing does warp from the heat and won't fit the spindle then it's neither use nor ornament eh?

Shame not to try a fix though.......

.......Bugger

[TwoBobRob]

Another arm is of course the easiest fix, but for a rider you could always just weld the thing and not bother about a rechrome. It'll hardly notice really. As for the heat distortion, the right welder will keep this to a minimum. Also as the splines are so very coarse, I suspect it'll always fit without much hassle   

[gjs]

I have a pair of 401's that the arm completely snapped off,which I welded back on without rechroming,doesn't get used but I would use for everday riding no jumps etc.The repair for yours would make any difference to the strength of the crank,I don't think