Senior Member
Join Date: Feb 2012
Location: Rochester, NY
Posts: 18,093
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4208 Post(s)
Today i served a customer that had 3 different crank arms loosen and require replacement, the third one was still on the bike. I did the usual explanation about steel axles augering out Al arms and not keeping the retain bolt tight. He was seeking a who new (and different arm/axle design) crank. His Mom gave funding for replacement arm #4... After I installed it I had the kid ride the bike outside (around the shop and lot) and I retightened the retaining bolts. I showed the kid how tight they needed to be and he said he never got them that tight. Interesting that he understood the terms and relationships (newton meters, torque and material strengths) but had no clue as to how much effort equated with anywhere near enough torque.
This is not an uncommon challenge for many. Andy
__________________
AndrewRStewart