I have an '05 Kona Cinder Cone and was looking to replace my large chainring with a bashguard... however, with my shifter/derailleur set-up, I'm not sure if I can simply lock out the top gear via the screw-stops, or if that will totally mess up my shift points. It's a TruVativ Blaze ISIS crankset with Deore top-swing (FD-M510) derailleur and shifter. Any suggestions?
With most front derailleurs all you have to do is adjust the high limit stop so that your front shifter can't go past the middle position. I had no problem doing just that on my Voodoo with an XT front derailleur. If you do go that route, I recommend also shortening the chain although it isn't strictly necessary.
Here's a quick and easy way to see if it will work - screw the high limit screw in until it won't allow you to shift past the middle. If the shifting seems fine and the derailleur stops where you want it to, then go ahead and put on the bashguard.
Tried that... the indexing goes all screwy. I read on the Shimano page that it is meant for a 3-ring crankset, and not to install it on a 2-ring setup, so adjusting the high stop is definitely not gonna do it. I suppose I could simply refrain from trying to shift to the bashguard, or go to a larger guard since my large chainring has the bolt holes to accept one. unfortunately, my bike shop doesn't have anything of that size. I wonder why?
'06 LeMond Versailles, '04 S&M Beringer, '03 Quamen Bowls, '68 Raleigh Grand Prix (converted to fixed gear)
Setting the high stop should have no effect whatsoever on the shift points. Did you drop the derailleur way down and set the height to the middle chainring or something? The derailleur should be positioned on the seat tube as though a large chainring were still present, some people goof up and set it as though the middle ring were the outer ring.
Fiddle with it for a while, try different heights and play with the limits some more. It should work fine.