mount recess calipers on old frame without radius washers
06-30-17, 06:00 AM
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mount recess calipers on old frame without radius washers
Hi bikeforums,
I have an 80s(ish) Peugeot frameset that has the weinmann 500 calipers and I recently got hold of some Shimano 105 SLR side pulls. The problem is that these use the recessed nut. I know all the Sheldon Brown options, but my LBS said that they would fit as is but without the radiused washers. Is this safe? I'm not sure I'd want that. Has anyone tried this? Are those radiused washers just for looks?
Thanks
I have an 80s(ish) Peugeot frameset that has the weinmann 500 calipers and I recently got hold of some Shimano 105 SLR side pulls. The problem is that these use the recessed nut. I know all the Sheldon Brown options, but my LBS said that they would fit as is but without the radiused washers. Is this safe? I'm not sure I'd want that. Has anyone tried this? Are those radiused washers just for looks?
Thanks
06-30-17, 06:04 AM
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Safe? Yes.
However, with that lousy purchase on the fork, you'll likely have issues keeping the brake centered.
However, with that lousy purchase on the fork, you'll likely have issues keeping the brake centered.
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06-30-17, 06:34 AM
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06-30-17, 06:40 AM
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You'll have a flat faced brake bolt sitting on a curved surfaced fork. So it will only make contact top and bottom.
Those annoying curved washers exist for a reason.
Those annoying curved washers exist for a reason.
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06-30-17, 07:18 AM
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yeah, that's what I thought. Seems like the LBS is trying to get rid of me instead of doing a thorough job. I'll put more pressure on them
06-30-17, 08:35 AM
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You can get the recessed allen nuts in a variety of lengths. Ream one of the radiused washers to accept the recessed nut, and use one long enough to extend through the washer and securely engage the mounting bolt.
06-30-17, 08:39 AM
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The usual way is to use your new front caliper (longer bolt) on the rear with an external nut and the spacers/washers needed to fit the brake bridge securely. For the front, enlarge only the hole in the back of the fork to accept a longer recessed nut to reach the short bolt of the other caliper. Use appropriate spacers/washers. The recessed nuts come in several lengths, measure or just get a couple to try. Assuming a steel fork, of course.
06-30-17, 09:23 AM
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Hi bikeforums,
I have an 80s(ish) Peugeot frameset that has the weinmann 500 calipers and I recently got hold of some Shimano 105 SLR side pulls. The problem is that these use the recessed nut. I know all the Sheldon Brown options, but my LBS said that they would fit as is but without the radiused washers. Is this safe? I'm not sure I'd want that. Has anyone tried this? Are those radiused washers just for looks?
Thanks
I have an 80s(ish) Peugeot frameset that has the weinmann 500 calipers and I recently got hold of some Shimano 105 SLR side pulls. The problem is that these use the recessed nut. I know all the Sheldon Brown options, but my LBS said that they would fit as is but without the radiused washers. Is this safe? I'm not sure I'd want that. Has anyone tried this? Are those radiused washers just for looks?
Thanks
I doubt that the Shimano 105 will be long enough.
06-30-17, 10:24 AM
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Shimano also did make 105 dp brakes in "long reach" (47-57 mm) format so it's possible they will work but, it's a good point to be sure.
06-30-17, 11:22 AM
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why not just do the Sheldon method......it is well proven. I have done it several times. the amount of material removed when "drilling out" the front fork is very lttle....you could do the same with a rat tail file
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07-01-17, 04:13 AM
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Or you can get Tektro/Shimano pattern longer bolts as after-market replacements.
Rebuild the rear as the new front and you're all set. Leaves room for a fender hanger too.
Rebuild the rear as the new front and you're all set. Leaves room for a fender hanger too.
07-03-17, 08:29 AM
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07-03-17, 08:31 AM
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I wouldn't want to remove material from the frame as I won't be able to sell it as original in the future
07-03-17, 08:33 AM
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Can't I just use a regular hardware store bolt (they even make them in stainless)?
Would a nutted bolt from a shimano arabesque caliper fit the 105? (I found some, cheap)
Last edited by bloodfont; 07-03-17 at 08:45 AM.
07-03-17, 09:16 AM
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As for the question, you can easily expand the holes for recessed nuts by using a Dremel. It can reach the rear hole without a problem, a drill can't. Then you expand the radiused washers too, you can use a drill for that.
Last edited by Barabaika; 07-03-17 at 09:23 AM.
07-03-17, 11:38 AM
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I got mine off eBay. Search for This:Tektro Bremsbolzen Umbau-Kit Standard auf Lang ältere Stahlrahmen R-539/540/559.
Seller speaks English and was willing to ship outside his listing.
You can also get a similar one here:https://www.sjscycles.co.uk/brakes/j...ut-conversion/
Or at least hugely unlikely.
The replacement bolt has a stepped thread. Something like M8 for a few mm closest to the Allen-face countersunk head, then M6.
No.
The Arabesque is a single-pivot, with a double-ended bolt going through both brake arms. A newer 105 needs a bolt that ends with a recessed/countersunk head that sits flush with the inner arm.
You can reuse the curved washers though, if you buy from SJS.
07-04-17, 02:52 AM
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Why would you use some workarounds when the Shimano BR-650 brake calipers have the required reach? I used them, they are of very good quality.
As for the question, you can easily expand the holes for recessed nuts by using a Dremel. It can reach the rear hole without a problem, a drill can't. Then you expand the radiused washers too, you can use a drill for that.
As for the question, you can easily expand the holes for recessed nuts by using a Dremel. It can reach the rear hole without a problem, a drill can't. Then you expand the radiused washers too, you can use a drill for that.
07-04-17, 02:53 AM
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https://i.ebayimg.com/images/g/YyQAA...o0H/s-l500.jpg
07-08-17, 05:46 AM
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So no one knows if caliper bolts are interchangeable between different models of calipers? To be exact, I need to replace the bolt on the 105 single pivot caliper (recessed mount) with a bolt for radiused washers.
Can I use the weinmann 500 bolt?
Can I use the weinmann 500 bolt?
Last edited by bloodfont; 07-08-17 at 05:50 AM.
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