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Keeping a Pletscher-style rack from sliding?

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Keeping a Pletscher-style rack from sliding?

Old 04-21-19, 06:55 PM
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Keeping a Pletscher-style rack from sliding?

I went on an overnight camping trip with my '52 Raleigh, and a problem I keep having came up again - I can't keep the rack that came with the bike from sliding down the seatstays. It's not a Pletscher; it's an "N.V. Slotenfabriek Hopmi" made in Utrecht. The part that is on the forward side of the seatstays is made by Pletscher though - added later, I assume.

Every so often, the rack just slides down, no matter how hard I tighten it - though I hesitate to tighten it too much. I have some handlebar tape around the seatstays where I want it to be, but it comes to rest on one of the arms of the sidepulls.

Sliding Hopmi Rack

I end up repositioning it and touching up the scratched paint, but that clearly is a losing battle. I'm thinking maybe some sort of rubber around the seatstay - I used to have some clamps to replace absent braze-ons that had a substantial rubber piece, but I can't currently find them. Has anyone found a good solution for this problem? Since the clamp is open on the sides, maybe I can tighten it further than I have been without worrying about damaging the stays, but I would rather solve the problem through good advice rather than an attempt at brute force.

The camping trip, by the way, went well. A few hills on the dirt forest service road were so steep I had to walk up them, but in general, the Superbe Sports Tourist lives up to its name as a touring bike.
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Old 04-21-19, 07:04 PM
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There was a once common accessory to prevent that. It was a T shaped piece of metal that attached to the brake bolt and prevented the rack from slipping down. It'd be fairly simple to improvise something that does the same.

Old-time Triangular rack support
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Old 04-21-19, 07:23 PM
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Thanks, that's a good idea. I'll keep an eye open for one of those, or for something from which to make one.
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Old 04-21-19, 07:25 PM
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For commuter duties (one pannier, maybe 20 lbs), I have had success with the same type rack with some old innertube used in the same way you have the handlebar tape. Not sure if your demands are heavier, but that may be worth a shot.
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Old 04-21-19, 07:51 PM
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Here's the rack support that Bike Warehouse (later Nashbar) used to sell in the '70s... It has been on my old Fuji since 1976/77! (and so have the tire savers!)

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Old 04-21-19, 09:27 PM
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Old 04-22-19, 09:22 AM
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What you could do is get a couple rubber-covered p-clamps of a size that fits snugly on the seat stays. Mount them so that the leg of the p sits flat against the flat metal strip at the front of the rack. Drill holes in the rack to match the holes in the clamps and bolt it all down with M5 bolts, a couple washers, and nylock nuts.
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Old 04-22-19, 10:14 AM
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A small block of wood, painted black, could be fitted between the bottom of the rack and the top of the brake bridge on the frame. This would prevent the rack from sliding down.
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