Issue installing braze-on Simplex SLJ shifters
05-10-20, 07:28 PM
#1
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Issue installing braze-on Simplex SLJ shifters
Hello all, I hope you all are well, so I purchased some Simplex retrofriction shifters for my 1985 Schwinn Voyageur and figured it would be a simple install, but the braze-on for the shifters will not accomodate the Simplex shifters. I was under the impression that all the downtube shifter brazeons were the same, so I was taken aback when I realized I couldn't install them. Given my shifter braze-ons, would it be possible to use these shifters? I apprecieate any insights on the matter.
05-10-20, 07:41 PM
#2
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I’m on my phone- but google “Shimano B Boss”
Also- are your shifters from clamp on shifters?
Also- are your shifters from clamp on shifters?
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05-10-20, 10:59 PM
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Yeah, that extra hickey was Shimano’s attempt at a new standard. I successfully carefully filed that square bit off a frame once.
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05-10-20, 11:23 PM
#5
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No these shifters aren't the clamp on variant, so they should have fit if the shifter boss' were they not the non-proprietary Shimano shifter boss'.
05-11-20, 12:40 AM
#6
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+1. The instructions are here.
05-11-20, 12:47 AM
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Before you get to work filing...
some Simplex shifters used a different pitch thread... not all metric is the same...
test, don’t guess
double check the needed boss length (depth into the shifter mech )
some Simplex shifters used a different pitch thread... not all metric is the same...
test, don’t guess
double check the needed boss length (depth into the shifter mech )
05-11-20, 01:58 AM
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As you can see, the Retrofriction shifter needs a square base to interface with so it won't just spin around when you operate the levers. Make sure you file down the round base in a way that you will end with flats to interface with the flats on theshallow square box on the shifter.
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05-11-20, 09:15 AM
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That's a Shimano "A-type" boss; the Simplex levers are designed to fit on Campagnolo-type bosses. Shimano used to offer a conversion kit (part #680 9858) to mount Campagnolo-type levers onto the A-type boss, but you still needed to replace the lever fixing bolts, as the A-type boss uses 4.5mm x 0.75mm thread, while the Campagnolo-type boss uses 5mm x 0.8mm thread.
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05-11-20, 09:41 AM
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And that's a wrap!
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