J∆kk∆ls Posted May 22, 2015 Posted May 22, 2015 QUESTIONWhy am I breaking Chainring Bolts on climbs? INFOThis the second time I have broken chainring bolts from steep climbs. The first time was 2 weeks ago when riding single speed (34-20) at the Wilde Gravel Travel.The chainring bolt that broke that time was a CSIXX. Tonight 2 bolts broke on my commute home over KloofnekSet up now is 1x10 and the bolts in question are KCNC. The crankset is a Race Face NW 34T coupled with Shimano XT crank arms. Really frustrated at the moment. Is this going to happen every time I put some power to the pedals?
Captain Fastbastard Mayhem Posted May 22, 2015 Posted May 22, 2015 get better bolts than those KCNC ones.
Fisan Posted May 22, 2015 Posted May 22, 2015 I have KCNC ones...no problems for the past year... Same Raceface NW chainring, Shimano crank... Do you torquewrench?
J∆kk∆ls Posted May 22, 2015 Author Posted May 22, 2015 get better bolts than those KCNC ones. That's what I was thinking! Any recommendations?
Captain Fastbastard Mayhem Posted May 22, 2015 Posted May 22, 2015 That's what I was thinking! Any recommendations?Standard shimano / SRAM goodies
J∆kk∆ls Posted May 22, 2015 Author Posted May 22, 2015 I have KCNC ones...no problems for the past year... Same Raceface NW chainring, Shimano crank... Do you torquewrench?Had them installed at LBS when the 991's broke. Will ask them.
J∆kk∆ls Posted May 22, 2015 Author Posted May 22, 2015 1 get better bolts. 2 don't tighten them to 69786564577557985 newton meters. Report back!Thanks will do!
the nerd Posted May 22, 2015 Posted May 22, 2015 Get some problem solvers short crank bolts, should solve your issue..
J∆kk∆ls Posted May 22, 2015 Author Posted May 22, 2015 Where are you? If in Cape Town on me. Will help out.Sweet! I'm in the Atlantic Sea Board. Going to LBS tomorrow morning. I always get great service from them and I feel they should know about this. I will message you when this is resolved and if this happens again! thanks mate!
JXV Posted May 22, 2015 Posted May 22, 2015 Are you using spacers between the crank and the NW ring?Does the base (female) side of the chain ring protrude past the chainring into the crank spider?Are you possibly over torquing the bolts?Riding 34-20 SS you must be standing up and pushing hard on the hills. What size wheels? Chainring bolts are acailable in steel and in titanium. Both are stronger than KCNC alu.
DJR Posted May 22, 2015 Posted May 22, 2015 You need to lay off the HTFU stuff a bit.........you just got too strong from the SS.............take a month or 3 and be lazy......before you know it, you'll be too weak to break chainring bolts! Otherwise get stronger bolts, steel or titanium.
CAAD4 Posted May 22, 2015 Posted May 22, 2015 Try diluting your Cytomax before you grow an unwanted appendage or snap a crank arm. That stuff is evil I tell you...
J∆kk∆ls Posted May 22, 2015 Author Posted May 22, 2015 Are you using spacers between the crank and the NW ring?Does the base (female) side of the chain ring protrude past the chainring into the crank spider?Are you possibly over torquing the bolts?Riding 34-20 SS you must be standing up and pushing hard on the hills. What size wheels? Chainring bolts are acailable in steel and in titanium. Both are stronger than KCNC alu.No Spacers The base side does not protrude it is sitting flush. Not sure about the torque, LBS installed, I will ask them tomorrow. Riding Cotic BFe 26"
BarHugger Posted May 22, 2015 Posted May 22, 2015 Post pics of the broken bolts. Maybe a better solution can be provided if the area of failure is visible.
J∆kk∆ls Posted May 22, 2015 Author Posted May 22, 2015 Try diluting your Cytomax before you grow an unwanted appendage or snap a crank arm. That stuff is evil I tell you...By Cytomax you mean Ouma's rusks and coffee yeah I'm trying!
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