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-   -   Raleigh Sports/700c brake caliper options... (http://www.bikeforums.net/classic-vintage/934648-raleigh-sports-700c-brake-caliper-options.html)

arex 02-18-14 09:36 AM

Raleigh Sports/700c brake caliper options...
 
I'm running into some serious problems with finding brakes that'll work on my Raleigh build.

To summarize: It's a Raleigh Sports frame that I'm using 700c rims with, and 700x37 Continental tires with. The tires are more like 35mm wide, rather than 37. The tires have a good amount of clearance on the frame, or so it seems to me.

Based on what Sheldon had to say on the matter (Tektro R556 were a good match), I got a pair of R559's (which superceded the R556). They cleared the tires just fine, both in height and width. However, the reach of them was too long...they were just barely short enough to use on the rear, but too long on the front to properly place the brake shoe on the rim.

I thought, okay, let's see what else is available. The Tektro R539's looked similar, but had a shorter reach in the range of what I needed. Got a pair, installed them, and found that they didn't clear the tires, both front and rear, and both height and width...totally unsuitable, since they were pressed against the tire at the top, and couldn't even be installed without letting air out of the tires. The reach was, however, perfect.

So, now I'm wondering what my options are. I'm eyeballing old Weinmann's and/or Dia-Compes, thought I'd like to stick with dual-pivot. They look like they have better clearance, but I honestly can't tell which ones would work, since I can't find any actual data or measurements of the old calipers.

Does anyone running 700's on a Raleigh Sports have any suggestions on some calipers that'll work?

RaleighSport 02-18-14 09:40 AM

Quote:

Originally Posted by arex (Post 16505502)
I'm running into some serious problems with finding brakes that'll work on my Raleigh build.

To summarize: It's a Raleigh Sports frame that I'm using 700c rims with, and 700x37 Continental tires with. The tires are more like 35mm wide, rather than 37. The tires have a good amount of clearance on the frame, or so it seems to me.
2
Based on what Sheldon had to say on the matter (Tektro R556 were a good match), I got a pair of R559's (which superceded the R556). They cleared the tires just fine, both in height and width. However, the reach of them was too long...they were just barely short enough to use on the rear, but too long on the front to properly place the brake shoe on the rim.

I thought, okay, let's see what else is available. The Tektro R539's looked similar, but had a shorter reach in the range of what I needed. Got a pair, installed them, and found that they didn't clear the tires, both front and rear, and both height and width...totally unsuitable, since they were pressed against the tire at the top, and couldn't even be installed without letting air out of the tires. The reach was, however, perfect.

So, now I'm wondering what my options are. I'm eyeballing old Weinmann's and/or Dia-Compes, thought I'd like to stick with dual-pivot. They look like they have better clearance, but I honestly can't tell which ones would work, since I can't find any actual data or measurements of the old calipers.

Does anyone running 700's on a Raleigh Sports have any suggestions on some calipers that'll work?

I'd be looking for some old dia comple single pivots very very very short, they do exist and are fairly plentiful but by the sounds of your problem though, I think you'll need the old school weinmann canti ones like you're thinking.

I am curious though, how old is this Sports and did you have to modify the dropouts/spacing?

arex 02-18-14 09:49 AM

It's a '74, and yes, I had to cold-set the dropouts, both front and rear. Not a huge amount, and I suspect that if I messed around with the spacers and nuts on the rear hub, I could go with the frame's original width.

RaleighSport 02-18-14 09:55 AM

Quote:

Originally Posted by arex (Post 16505548)
It's a '74, and yes, I had to cold-set the dropouts, both front and rear. Not a huge amount, and I suspect that if I messed around with the spacers and nuts on the rear hub, I could go with the frame's original width.

Interesting.. on my 72 I would need to file out the dropouts just to meet axle width for a 700c wheelset is more what I was getting at.. although the rear triangle on that bike is so age hardened I'd hate to imagine trying to spread it!

Best of luck to you with your retrofitting!

arex 02-18-14 10:12 AM

Quote:

Originally Posted by RaleighSport (Post 16505568)
Interesting.. on my 72 I would need to file out the dropouts just to meet axle width for a 700c wheelset is more what I was getting at.. although the rear triangle on that bike is so age hardened I'd hate to imagine trying to spread it!

Best of luck to you with your retrofitting!

I'm using a new Sturmey AW hub. Dimensionally, it's the same as the old AW's, but it has a longer axle and spacers to take it out to 130mm. I could take the spacing down to 112-115mm by eliminating the spacers and wider locknuts. However, I'd have to use a bunch of spacers on the outside of the dropout to ensure the outer drive-side nut is where it's supposed to be. I already have a 3mm spacer in there to achieve this, it didn't come from the factory with the correct spacing. I was seriously considering shortening the axle, until several other members here talked me out of it.

RaleighSport 02-18-14 10:23 AM

Quote:

Originally Posted by arex (Post 16505628)
I'm using a new Sturmey AW hub. Dimensionally, it's the same as the old AW's, but it has a longer axle and spacers to take it out to 130mm. I could take the spacing down to 112-115mm by eliminating the spacers and wider locknuts. However, I'd have to use a bunch of spacers on the outside of the dropout to ensure the outer drive-side nut is where it's supposed to be. I already have a 3mm spacer in there to achieve this, it didn't come from the factory with the correct spacing. I was seriously considering shortening the axle, until several other members here talked me out of it.

Yup, they were wise to talk you out of it too! You never know what that wheelset will end up doing in the end. I'm also curious as to why are you doing this? Is the frame small for you or something? Personally I like the ride of the 26x1 3/8 tires nice and cushy.. when I feel like riding a 40lb bike that is.

arex 02-18-14 10:26 AM

I started with just the bare frame, and since I was going to have to get wheels (among other things), I may as well just update things. Some of these updates have gone reasonably well, like the BB...other things, like the brakes, have gotten kind of exciting.

RaleighSport 02-18-14 10:28 AM

Quote:

Originally Posted by arex (Post 16505706)
I started with just the bare frame, and since I was going to have to get wheels (among other things), I may as well just update things. Some of these updates have gone reasonably well, like the BB...other things, like the brakes, have gotten kind of exciting.

Fair enough! I can't tell you how many escapades have started because I got a bare frameset.

Tim_Iowa 02-18-14 01:42 PM

Quote:

Originally Posted by RaleighSport (Post 16505519)
I'd be looking for some old dia comple single pivots

It sounds like the proper brake reach with that frame and those rims is in the "standard reach" range, 47-57mm. It's tough to fit a 35mm tire under standard reach brakes; the max I could fit under Tektro 539's is a 32mm Pasela.

Dia-compe / Weinmann 500 single-pivot calipers might work. They're plentiful in used parts bins and have better clearance than dual-pivot calipers.

Dia-compe 510 centerpulls would probably get you the best tire clearance for that reach, but they're pretty hard to find.

arex 02-18-14 03:42 PM

Quote:

Originally Posted by Tim_Iowa (Post 16506378)
It sounds like the proper brake reach with that frame and those rims is in the "standard reach" range, 47-57mm. It's tough to fit a 35mm tire under standard reach brakes; the max I could fit under Tektro 539's is a 32mm Pasela.

Dia-compe / Weinmann 500 single-pivot calipers might work. They're plentiful in used parts bins and have better clearance than dual-pivot calipers.

Dia-compe 510 centerpulls would probably get you the best tire clearance for that reach, but they're pretty hard to find.

Cool! Thank you...there aren't any 510's on eBay, but there's no lack of 500's. I'll give those a try.

Salubrious 02-18-14 09:30 PM

Quote:

Originally Posted by RaleighSport (Post 16505719)
Fair enough! I can't tell you how many escapades have started because I got a bare frameset.

:lol:

But seriously a set of Weinmann centerpulls might sort things out, although you would have to find cable stops. The side pulls will stop you but they don't have the stopping power of a dual pivot. If set up right Weinmann centerpulls are not bad at all. $2.00 at your local bike shop used bin...

RaleighSport 02-19-14 09:18 AM

Quote:

Originally Posted by Salubrious (Post 16507700)
:lol:

But seriously a set of Weinmann centerpulls might sort things out, although you would have to find cable stops. The side pulls will stop you but they don't have the stopping power of a dual pivot. If set up right Weinmann centerpulls are not bad at all. $2.00 at your local bike shop used bin...

Oh I totally forgot about those brake cable stops they have for seatpost binder bolts if your frame doesn't have the stop too.. you'll probably need those as well.

arex 02-19-14 10:15 AM

Quote:

Originally Posted by Salubrious (Post 16507700)
:lol:

But seriously a set of Weinmann centerpulls might sort things out, although you would have to find cable stops. The side pulls will stop you but they don't have the stopping power of a dual pivot. If set up right Weinmann centerpulls are not bad at all. $2.00 at your local bike shop used bin...

Yeah, given my size, braking power is of great concern. Centerpulls are what I'm going to round up.

arex 02-19-14 10:16 AM

Quote:

Originally Posted by RaleighSport (Post 16508723)
Oh I totally forgot about those brake cable stops they have for seatpost binder bolts if your frame doesn't have the stop too.. you'll probably need those as well.

Not a problem...those are easy to find.

RaleighSport 02-19-14 10:18 AM

Quote:

Originally Posted by arex (Post 16508925)
Not a problem...those are easy to find.

If your hunt gets rough let me know, I've got tons of the stem mount stops, probably quite a few of the binders still.. and quite possibly a few spare dual pivot centerpulls.

arex 02-19-14 10:20 AM

Quote:

Originally Posted by RaleighSport (Post 16508931)
If your hunt gets rough let me know, I've got tons of the stem mount stops, probably quite a few of the binders still.. and quite possibly a few spare dual pivot centerpulls.

Thanks, I'll keep that in mind. I've already rounded some up on eBay.


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