Does anyone know if the standard reach version of these will fit 700cc wheels on a frame designed for 27"?

https://www.velobase.com/ViewSingleCo...=117&AbsPos=13



i have what i believe is the short reach version, and the rear works, but the front is too short. I'd like to get a standard reach from and use it with the rear but I dont know if it will work.

Anyone using these on a 700cc conversion?

It depends. All bikes are not built the same. You need to measure the reach for the bike and find a brake that meets those requirements.

I got those, in the medium length version, on my 1984 Trek 610 when it was new. It came with 27 inch wheels. I've since converted to 700C using the same calipers.

There should be a pair of numbers on the back of the caliper, something like "46-54," which would indicate that the caliper is intended for a brake reach of 46 mm to 54 mm. I think (going just from memory here) that these numbers are typical of the medium reach. Actually I've just looked at my short reach set, and it says first "BR-6207" the model number, then "MAX 49 - 39 mm." The 610 frame is a bit tight-clearance with 700C, and fits fenders with tubulars but not well with 28 mm clinchers. My brake shoes are all theway at the bottom with 700. I would not be surprised if with a mure generous frame, the medium 6207caliper is hard-pressed to reach a 700 rim.

However, if your brakes are the short reach 49-39, you should work out well if you substitute a set of the medium reach.

Road Fan

The reach is stamped on the rear of the calipers in your photo. The Shimano 600 longer reach calipers have a stamped reach of 47-57, but a pair that I have will reach what I measure to be 59 mm. That's just enough to go from 27 inch to 700C on a Nishiki frame I have. You need to measure the distance from the axle centerline to the brake mounting hole on both front and rear of your frame, to know if 57-ish will be enough. There's a lot of variation in frames, across both manufacturers, and the decades of manufacture. Older bikes tend to require longer reach. Older English bikes, particularly, have rather long reach required for the rear wheel.

While getting a pair of longer-reach calipers may, in fact, be the cheapest solution, there are things called "drop bolts," if you can find one, that will provide greater reach (but not greater clearance if fenders are part of the build).

mine just say 57 on them. I guess I need to find something substantially longer than that. I'll measure to get a better idea. It's a shame because I built the rest of the bike with vintage 600 stuff so I wanted to use the same for the front. Now i'll just be happy if I can stay with a side pull.

There's no Campagnolo sidepull that will reach longer than 57 mm. Ones that you may find on eBay are the Weinmann (also knocked off by Dia-Compe) 730 (71 mm), Shimano Tourney (several models, with varying reaches, but all in the "long" range). Sometimes you'll see some vintage rare types like CLB. Once you know the reach you really need, it's a good idea to correspond with seller and verify that brakes will meet that reach.

Tektro makes a modern two-pivot sidepull with reach 55-73, better mechanically than older single-pivot models. R556, and you should be able to see it here
https://www.tektro.com/02products/10rb-1.php

There's a set at the flea market, I will check the length when I go this weekend. The front has a bent mounting shaft, but it can be swapped out I imagine? Same style of cone nut as the ones in the pic.,,,,BD

I use 700c wheels on my Centurion Comp TA (originally 27in wheels, all Shimano 600 components) and they fit fine with no adjustments.

I have this cheapo Shimano Tourney caliper on an '80 UO-10. It's got a 75mm reach, but truth be told I'm not too impressed with the workings of it. Not great looking either. I'm gonna put the Racer centerpull back on. How's that for a sell, ah?

What year are those 600s? They're great looking.

not really sure, but I think early-mid 80's.

Yeah, they are. I have BR-6208's on my 87 Miyata; they look exactly the same (nice). They actually stop OK with modern pads.

They're about 1985 or thereabouts. The 85 Romic I just got has them, as did the 85 Super Sport. I checked the one's on the Romic with you in mind. Max 57 as well. I was hoping I could help you. BTW I needed some really long brakes on my Nishiki Century when I installed 700's. It reminds me of the reach on a Schwinn SS or an older English bike. I ended up with centerpulls. They seem to work okay, but don't look as cool.,,,,BD

Yes, no problem 27" Araya A20 to 700c Mavic CXP-23