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Y'know, to be honest, I didn't know an indexed bar end for two chainrings even existed. I thought it would be on either one ring or the other, no possibility of over-shooting into the next gear ('cuz there's no next gear) & no indexing required. I run my shifters in friction, so I never have to adjust anything & my shifts are quieter.
I've got some suggestions to try (yeah, like that's a surprise), but if anyone knows the answer for certain please fill us both in!
Here's what I'd check first:
Undo the cable from the front derailleur & move the bar end all the way from one end of its range to the other. Does it have more than one click? If it has two clicks, it's already compatible with a triple ring setup & all you'll need to do is slaken the cable to allow for the extra travel. (Old Shimano thumb shifters had an "extra" click in them that would allow you to adapt up to the next larger cog stack & keep your indexing.)
If there's only one click, does it instead have a "friction" setting? If so, you can turn the dial to "F" & avoid having to tune your indexing to the new positions of three rings. Just slacken the cable. (OK, there's still some fine-tuning involved, but not to the extent that indexing requires.)
Other than that, the indexing mechanism is internal to the shifter & I don't know if it's modify-able (but I'm guessing it isn't).
And don't forget about the other parts. If you're changing from a double crank, you'll probably need a wider bottom bracket to push the rings out a bit farther from the frame. Chewing up a carbon fiber chainstay with a new third ring would be ... unfortunate. And, depending on your chainring combination, you might not get crisp shifting from the small ring to the middle ring with a double front derailleur. Triple front derailleurs typically have a lower inner cage plate to help with this. But that depends more on what you're used to (for crispness) & what ring combo you pick (with some combos, the dropped inner plate may run into the rings; this is usually not a problem). Oh, & you'll have to reset the stops on the derailleur to allow the extra travel. And maybe move it up or down so the wider swing fits the new rings. What's the tooth range for your existing rear derailleur? Will you be changing the cogs in the rear?
I know this sounds like a lot to consider. Probably, you can simply:
1) drop in a wider BB
2) bolt on the new cranks
3) slaken the cable
4) reset the derailleur stops
5) adjust the cable length to fit the shifter throw
6) ride
If you've got a second click in there, great. If not, turn it off & go friction.
Anybody else have any suggestions?
posted by 146.82.1...
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