I've had my Spank spikes for a little over a year. I have quite a few bikes, and I have my Spanks on my AM rig. Every time I ride that thing, the Spanks will squeak in the later part of the ride, on steep climbs.
These pedals have gone through two sets of IGUS bushings and the axle upgrade by SPANK in my attempt to address the noise issue.
I like these pedals. The mild stiction that prevents them from spinning when I loose the pedals on a jump is a big plus. I also like the low profile and their hardiness.
I've finally decided to sit down and try and fix the issue. You know what they say, if you want something done right.....blah blah blah.
So here's my fix. IGUS bushings are known to squeak. Apparently, the phenomena is called "stick slip".
"If the surfaces are too smooth, however, higher adhesion results, i.e. the surfaces adhere to each other. Higher forces are necessary to overcome the adhesion, which results in an increased coefficient of friction. Stick-slip can be the result of a large difference between static and dynamic friction and of a higher adhesive tendency of mating surfaces. Stick-slip also occurs due to intermittent running behavior and can result in loud squeaking."
My solution is to rough up the pedal axle where it meets the bushing.
"Time and again, it has been observed that such noises can be stopped or eliminated with rough shafts. Thus, for applications with the potential for stick-slip - slow movements, large resonance of the housings - attention must be paid to optimizing the roughness of the shafts."
I confirmed during my last bushing replacement that the axle has a mirror finish where it mates to the bushing.
igus® - iglide® Plastic Bushings: Coefficients of Friction
Bearing noise/squeak – check shaft surface finish / possibly roughen shaft.
igus® - iglide® Plastic Bushings: Tolerances
It cant be too rough. "If the shaft is too rough, abrasion levels play a significant role"
Satin finishes are usually at 220 to 380 grit. The key here is to roughen up the axle just enough that regular use wont smooth out the surface back to a mirror finish.
Hope that helps someone out there.
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