New Brakes on Old Sekai 2500
04-27-08, 09:57 AM
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New Brakes on Old Sekai 2500
Hi guys....I need a tip on my old road bike. I see brakes have improved in design from my original Dia-Compe guys to double pull brakes that don't like to rub on one side like my old ones do. I see Shimanos on ebay but I wonder if they fit my old frame. The little hole in the frame that the brke mounts on....is it the same? Also....when they say the brakes are for a road bike are they talking about 27 inch wheels? Am I looking for a 39 to 49mm standard reach? By the way. If any of you guys see one of these old frames you should get it. I'm going on thirty years with mine. It's so light.
04-27-08, 04:56 PM
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the hole in the frame has not changed. the relationship between the hole and the rim is constant, depending on whether the frame was built for 27" or 700c rims. That relationship can wildly vary, but if you can find modern brakes with the same reach as the old dia-compes, you'll get a fit. The levers contribute greatly to the brake force equation, and you should consider upgrading them as well if you want the best performance from your investment.
04-27-08, 06:26 PM
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Just measure from the hole to the rim to get the reach you need. A problem you might run into is the mounting bolts. Newer brakes use recess nuts to hold the brakes onto the frame. The recess nuts won't fit in the rear brake bridge hole, so you need to use the front on the rear and use a regular nut.
But, with this done, you don't have enough bolt for the front.
There are a couple of things you can do to overcome this. You can get two front brakes, you can get a longer recessed nut or you can place the recessed nut inside the head tube.
I believe that Shimano sells the brakes separately, so you can get two front brakes. I think this is the best method. If you have a front and rear brake, I like using a longer recessed nut. I had to get a longer one, then I cut it down a bit so that it would screw all the way down to the frame.
I had mine on the frame using the smaller recessed nut inside the frame until I was able to get a longer one. This works, but I just don't like having the brake bolted on to just one side of the head tube.
But, with this done, you don't have enough bolt for the front.
There are a couple of things you can do to overcome this. You can get two front brakes, you can get a longer recessed nut or you can place the recessed nut inside the head tube.
I believe that Shimano sells the brakes separately, so you can get two front brakes. I think this is the best method. If you have a front and rear brake, I like using a longer recessed nut. I had to get a longer one, then I cut it down a bit so that it would screw all the way down to the frame.
I had mine on the frame using the smaller recessed nut inside the frame until I was able to get a longer one. This works, but I just don't like having the brake bolted on to just one side of the head tube.
04-27-08, 08:56 PM
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There are a few brakesets that have a dual pivot front and a single pivot rear (newer campy record) but mostly it is just the length of the mounting bolt, as SweetLou says. you can often replace the center bolt with another (there is a lot of uniformity in the industry here) and make a rear brake work on the front (or visa versa, I guess).
