Here's my 91 Rockhopper 1x and a mechanical question...
07-15-20, 01:02 PM
#1
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Here's my 91 Rockhopper 1x and a mechanical question...
I finally put this beauty together. She's a 1x8. The question I have is this: I replaced the BB with a cartridge type. In order to install it, I had to remove the screw that holds the cable guide underneath the BB. Now, the cable guide obviously doesn't stay put and I'm slipping gears. Will a random shorter screw do the trick to hold it in place? Is there another option? What do I do!? I did trim the plastic part that protrudes into the BB enough so that the cable guide will sit flush. It looks like it would stay in place if I had a short screw. How have y'all solved this issue?
07-15-20, 01:35 PM
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I ended up gluing the cable guide to the frame when I rebuilt my late 80s Stumpjumper Comp but I cannot remember what kind of glue I used. I had the exact same problem as I replaced the BB with a shimano sealed unit. Plus I couldn't change the cable guide since it has a 3d slot for the brake cable for the u-brake.
Last edited by bikemig; 07-15-20 at 01:42 PM.
07-15-20, 01:53 PM
#3
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i have made do with a shorter screw in these cases - so yes.
07-15-20, 03:11 PM
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Only need to shorten the screw so that it is long enough to grab the BB shell thickness. Can be tricky without messing up the threads, helps if you have a nut the same thread pitch to install before shortening, then when you back the nut off it cleans the threads
I would ensure you get it anchored by a screw rather than adhesive
I would ensure you get it anchored by a screw rather than adhesive
07-15-20, 03:18 PM
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Remove BB, mount guide and screw, hand file excess screw?
07-15-20, 03:39 PM
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Cool bike. Love that turquoise color. Is that one of those new Microshift thumbies?
This Rockhopper Sport is a 1990 model. That's the only year that hollow outlined Specialized logo appears on the top tube.
This Rockhopper Sport is a 1990 model. That's the only year that hollow outlined Specialized logo appears on the top tube.
07-15-20, 04:24 PM
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+1 great colours on bike and background. How did you do the grips? They're the grace note.
07-15-20, 05:10 PM
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Thanks! The shifter is a SunRace M96. Well-made, indexed, 8-spd. No friction mode, though I like to have the option.
07-15-20, 05:13 PM
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Not sure what you're asking about the grips... But I did have to shorten them because they were too long. The bar-end plugs were randoms from the parts bin that happened to fit the bar. The ODI ones that came with the grips didn't fit.
07-15-20, 06:00 PM
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Sorry, I thought they were hand wrapped or some other exotica I've never played with. Off the shelf grips then? Where?
07-15-20, 09:14 PM
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I had to deal with this on my late 80s RockHopper. I got most of a bike but no cable guide. I’m using the Campy metal guide. Glued on with rubber cement and then I took a small bit of a rubber shim like you use attaching lights to handlebars and glued that in the middle to cover the hole (and keep water out of the BB).
Otto
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07-15-20, 09:45 PM
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+1 above. I've always just cut or filed the screw down when converting to cartridge. That said, the cable tension should keep the guide at least roughly in place, and even if it moves, that shouldn't allow the cable to move enough that it would cause a ghost shift or slip.
07-15-20, 09:51 PM
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Since you only have the one shifter, you could even use a single housing stop on the downtube and a short section of housing from there and under the BB to protect the finish and keep the cable from sliding off the BB and onto the axle. It should be held enough in place by tension to not shift down much. Then you just need to cover up that BB hole to keep water out. At least that’s another option. Back when I also ran a FD, I did that for its cable and it worked fine.
Otto
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07-15-20, 11:25 PM
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Can you put one or two or however many washers are needed under the screw head to keep it from bottoming?
07-16-20, 01:01 AM
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I usually use washers as 73StellaSX76 mentioned. Easy to add and remove as needed.
07-16-20, 09:10 AM
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^^^^ I'd rather not have the screw head protruding like that. Sometimes I'll add one washer, but beyond that, I either cut/grind the screw or find a shorter one.
07-16-20, 09:27 AM
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I think it's a little better to cut or file the end of the screw, rather than use washers—more threads engaged. But, really, it shouldn't take too much to hold the guide in place.
07-16-20, 09:40 AM
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07-16-20, 11:40 AM
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Otto
07-16-20, 03:33 PM
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07-16-20, 03:35 PM
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Yup. Or get a shorter screw. Either is preferable to the cables just sliding all over everywhere.
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07-16-20, 04:06 PM
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