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Raleigh Twenty Seat post clamp?

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Raleigh Twenty Seat post clamp?

Old 06-25-17, 10:08 AM
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Raleigh Twenty Seat post clamp?

I picked up my first Raleigh Twenty. Its the white model. It is going to need a full bath and new tires for sure.

There was no seat post clamp and the previous owner had the seat post all the way down and then drilled a hole through the seat tube (frame) and seatpost to hold it at that height......which is quite sad. He must have had it setup for his kids to ride or somthing. No normal sized person could have ridden it this way. Im real short and there was no way it would have worked for me.

Anyway.....i dont see where an actual clamp would go. There is a very small cut out on the rear of the where you insert the post into the frame which would be the squish point for a clamp but the seat stays come up and are welded right on the sides of the top of the post. I dont see how any clamp would hold here? Perhaps this is normal and the craftsmanship was just a bit sloppy. I need to get a proper clamp for a 20 and try it i guess. Can anyone post a picture of how their clamp fits on here? The strange thing is i dont see any wear marks in the paint where a clamp once was at all.

I believe this one is a 1972. It looks like some of the newer frames have the cutout "squish" point on the front of the seat tube as well as the rear and the stays sit a bit lower? I will try and post a picture of it when i get a chance.
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Old 06-25-17, 10:16 AM
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Check link below, it is a collar clamp

https://www.dropbox.com/sc/whypcokiy...YSqf1gwhYnQ-wa
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Old 06-25-17, 10:19 AM
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Why does this forum have such a problem measuring things , and stating that?
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Old 06-25-17, 10:31 AM
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yup....thats what i need it seems. In that picture you can see that clamp sits on the seat stay wells on bottom and has almost no seat tube showing on the top. It must be quite a thin collar...but it does appear to be what i need. I see they are still available on ebay shipped from england. Ill probably go that route. Here is to hoping i get it before summer is over. In the mean time i have a lot of cleaning to do.
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Old 06-25-17, 11:17 AM
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....and i might be screwed.

There is no way a clamp is going on here. I wonder if the previous owner cut it> i dont see any saw marks on the top of the seat tube but how would a clamp go here? My guess is it wouldnt and its junk. It must have been cut on the top. IT is a real smooth cut if so....nice and square. Why someone would do that is beyond me. I wonder if a small section could be welded on top to fit the collar or if a shim could be welded in the seat tube. The former would be the best way to go as i could still use the original seat post. Might be a lost cause.
Attached Images
File Type: jpg
twenty (1) - Copy.jpg (94.9 KB, 92 views)
File Type: jpg
twenty (2) - Copy.jpg (97.7 KB, 89 views)
File Type: jpg
twenty (3) - Copy.jpg (95.0 KB, 89 views)
File Type: jpg
twenty (4) - Copy.jpg (95.9 KB, 90 views)

Last edited by scale; 06-25-17 at 01:13 PM.
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Old 06-26-17, 05:58 AM
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i wonder if i could get a section of pipe with the same diameter and weld it to the existing and fit a clamp to it? All it really requires is the seat from going up and down. Enough post should extend into the frame to keep it from cracking.

I am betting it wouldnt be worth the cost though. Sad because the rest of this thing is in great shape.
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Old 06-26-17, 06:47 AM
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@scale, it has been cut and I do not really see a way to fix it other than welding an extension of tube on. . . I would strip it and hunt out another frame.
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Old 06-26-17, 06:48 AM
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Seat tube outside measurement should be 29.8 mm
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Old 06-26-17, 07:13 AM
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Originally Posted by Bicycle Addict
@scale, it has been cut and I do not really see a way to fix it other than welding an extension of tube on. . . I would strip it and hunt out another frame.
Yeah.....sad but that was my thought as well. It is such great shape otherwise....

I know the local three speed group here in MN has a swap every fall and last year a guy had a Tweny frame for sale at a fair price. I didnt pick it up because i thought "where am i ever going to find the rest of the parts to build it up?" ......Now here i sit.

Id certainly be in the market for it now. I wouldnt be opposed to welding a fix onto this frame either but clearly that would destroy all resale value down the road if i ever went to sell it. This is not my goal but i always try to keep that in mind.

Such a cool little bike. I have always wanted one. Perhaps someday i will find a frameset.

Thanks for the feedback everyone.
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Old 06-26-17, 09:14 AM
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Too bad the bike is drewed. What is stopping you from drilling a new hole in the seatpost so it's at the right height and bolting it in place?
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Old 06-26-17, 09:28 AM
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That sucks,I had a early BMX/Freestyle frame that someone did that to, it was done to get the seat lowered, WTF lol. Frame would have been worth a pretty penny if it wasn't for that. I toyed with the idea of getting something welded on there but then decided it really wasn't worth the trouble and gave it away with a bunch of other 20" bikes I had laying around.

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Old 06-26-17, 09:49 AM
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Originally Posted by Roll-Monroe-Co
Too bad the bike is drewed. What is stopping you from drilling a new hole in the seatpost so it's at the right height and bolting it in place?
Good point. I find that it is quite tricky to get the proper height/fore/aft saddle adjustment. My luck id be a few mm off in either direction and be stuck there. I guess i wouldnt be any worse off than i am now. Id have another hole in the seat post but that isnt an problem.

At that point trying to weld on small section to allow for a clamp should be fine too as long as the clamping itself doesnt crack the weld. I dont think it would. The cost of welding it might be prohibitive......and futher....finding the right sized pipe with the proper ID and OD might be tough.

Last edited by scale; 06-26-17 at 02:17 PM.
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Old 06-29-17, 06:37 AM
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Can you fit a normal available collar clamp on a twenty? I might have a frame guy that can weld on the bit at the top of the seat post. I just want to be sure im going to be able to find a proper clamp that will fit. The original is long gone.
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Old 07-06-17, 05:29 PM
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And im all fixed up..... Local frame builder did this for me.
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Old 07-06-17, 09:05 PM
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Yes!
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Old 07-07-17, 12:33 AM
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Sweet fix! Another old frame rescued from the scrap yard!
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Old 07-08-17, 10:52 AM
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i am pretty excited about getting it fixed and cant wait to clean it up and take it for a spin. I rebuilt the rear hub last weekend. It was bone dry and all gummed up. Indicator chain was frozen etc etc. Pulled it all apart and cleaned off the gunk, reoiled everything.....now it works perfectly. The gummed up bits were so bad that the little top hat piece on the axel was stuck and you couldnt get the flat pin out of the slot or the collar off the pin. It was a real mess. Like new now though.
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Old 07-08-17, 12:21 PM
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Raleigh Twenty Tires

I picked up a brand new set of Primo V-Monster tires in 20x1.95 at my local shop today. These tires look great and i was hoping to use them on my Raleigh Twenty rebuild.

Back fits fine but the front is a NO go. It rubs the upper forks on both sides. I was so bummed. These tires looked so fast.

Back to the drawing board.

Looking for fast/low rr 20x1.75 recommendations for my R20 at an affordable price. I was surprised to see the cost of 20 inch tires is still quite expensive. IM going to check out a few more local shops that sell used parts to see if i can source something there.
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Old 07-15-18, 08:47 AM
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Originally Posted by Bicycle Addict
Seat tube outside measurement should be 29.8 mm
changed seat tube clamp on R20 to generic alloy QuickRelease type, fwiw it needed one sold as 31.8mm
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