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Old 09-07-11, 12:32 AM   #1
jonli
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R-500 8spd brifter won't span triple crank

Hi. New to the forum (forums) and I need your help.
New Shimano 8 spd brifters. Left side (front) does only 1 2/3 swipes of upshift, which only gets through two of the three chainrings. 2/3 into the second swipe it stops just before the second click. With a return back to vertical a third swipe goes less than a click before coming to a stop (with no actuation of the cable if it is connected). The brifter behaves this way whether or not there is any tension or even a deraileur cable attached.
Is this normal? Shouldn't the brifter make a full second swipe to get to the 1st or 3rd chainring?

(The XT deraileur shows full range of motion when I manually stress the cable by pulling sideways on the section along the down tube, so the brifter seems to be the cause.)

Thanks!
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Old 09-07-11, 06:15 AM   #2
Kimmo
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1. New 8spd? You mean new old stock?

2. Are you sure you have a triple front shifter? Most are doubles. The third click is a trim position to prevent the FD rubbing.
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Old 09-07-11, 08:23 AM   #3
jonli
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Yes new 8spd. The R500 is a 105 level 8speed shifter still made (presumably) for high end vintage replacement and touring bikes. It's listed to be compatible with 2 or 3 chain rings.
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Old 09-07-11, 08:30 AM   #4
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The instructions indicate that FD 3300 front deraileur should be used for 2 chain rings and FD 3303 deraileur with 3 chain rings. Is this my problem? Are the R500 and XT front deraileur incompatable??
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Old 09-07-11, 11:44 AM   #5
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Uh, I think the MTB FD uses a different actuation ratio these days, IIRC.

Quote:
Originally Posted by jonli View Post
Yes new 8spd. The R500 is a 105 level 8speed shifter still made (presumably) for high end vintage replacement and touring bikes. It's listed to be compatible with 2 or 3 chain rings.
Hey wow, neato.
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