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"custom" chainring guard(11 posts)

"custom" chainring guardiml
Sep 10, 2003 6:35 AM
I'm having some trouble finding an in-stock guard for a Shimano crank. So, thinking about using a front deralleur, possible pinching and stretching a wee bit in the right places to provide clearance and security. Any thoughts on viability?
It's always dangerous when I venture into...Dwayne Barry
Sep 10, 2003 6:49 AM
mechanical issues but I think another solution that I've heard about/seen people use rather than a derailleur is to mount the single chain ring on the inside position and mount a chainring for the outer position that has had it's teeth filed off to act as a guard in that direction and then to use Third-eye chain guard to prevent the chain comimg off on the inside.
re: Another idea ive heard ofjrm
Sep 10, 2003 9:10 AM
is taking a shimano 48 to 52T ring and grinding off the teeth, and ramps.
re: Another idea ive heard ofMShaw
Sep 10, 2003 9:55 AM
I bought a Specialized crankset from a guy that had a 42/52 chainring set on it. The 52 had had all the teeth filed off as a SS chain guard. I never rode it, but it looked like it'd work.

re: why file the teeth off?richpierce
Sep 10, 2003 12:19 PM
I think it would work w/o filing the teeth off the big ring. Just set the derailleur so it can't go there (if you're using a derailleur). Then you still have the big chainring to use someday. Ok, I admit, it does not scream "CHAIN GUARD!"
re: why file the teeth off?flyweight
Sep 10, 2003 2:32 PM
The reasons you want to lose the teeth are:
1) Weight
2) On really rough terrain the chain can bounce and catch the on the teeth of the larger ring. Not enough to shift but enough to mess things up.
re: why file the teeth off? reason 3atpjunkie
Sep 10, 2003 4:02 PM
having exposed teeth for no functional purpose is just exposing your leg to damage. I've had some serious chainring bites from 'used' big rings (on an mtb) to have exposed teeth that you'll never use is silly and dangerous
re: "custom" chainring guardatpjunkie
Sep 10, 2003 1:29 PM
cx world has a variety of guards. when you say Shimano are you saying 130 Shimano?
re: "custom" chainring guardflyweight
Sep 10, 2003 2:35 PM
Back in the early to mid-80's many riders used only one chainring on flat time trials and would use a "modified" front derailleur as a guard.

I don't think it would work that well for 'cross. On rough terrain the chain will bounce around too much. A dual ring guard set up is best followed by a chainring guard outside/third eye inside arrangement.
Another option...KonaMan
Sep 11, 2003 10:43 AM
I used to know a bunch of guys that worked at Boeing and had access to a CNC press. They took the big ring and made a custom "bash guard" using scrap metal they had in their facility. Not an easy thing to get if you don't know someone that works in a CNC shop, but if you do, it takes no time to make one that is light and will take a serious beating.
yet another chainring guard optionfilipo23
Sep 18, 2003 12:11 PM
there's a guy here in Colorado who's got molds for FSA guards and is going to form fiberglass guards with them. Potential benefits: cheap, light, totally useful. Will post if dream becomes reality.