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Modern brakes on older frame(8 posts)

Modern brakes on older frameKDS
Sep 20, 2001 6:31 PM
Just a quick question - are modern calipers (105, etc.) compatible with a circa 1980's Austro-Daimler (700c wheels), or is there a difference in the mounting bolt to rim distance? I really enjoy riding riding this old bike, but the weinmann brakes leave much to be desired. Thanks for any advice.
Kevin
re: Modern brakes on older frameAndy M-S
Sep 21, 2001 2:41 AM
On many bikes that used older brakes, you can fit long-reach double-pivot ("modern") caliper brakes. The best of these is probably the Shimano RX100, which is available at Lickton's and a few other places for a reasonable price.

Most newer bikes have very little tire clearance, and use short-reach brakes...
Normally not but sometimes yes.nee Spoke Wrench
Sep 21, 2001 5:56 AM
Andy's right as far as he goes, but bicycle frames have changed quite a bit in the past 20 years and brakes are one component that usually won't work.

As Andy said, modern frames tend to have real short wheelbases and tight tolerences in the frame. Older bikes, on the other hand, often had lots of space for fenders and consequently used brakes with a real long reach.

Take a square and measure as accurately as you can the vertical reach distance from the middle of your brake mounting hole to the middle of the brake surface on your rim. Any decent supplier will be able to provide you with the reach measurement of the caliper brakes you are considering. As Andy said, the longest of the modern brakes that I am aware of is RSX with 47 to 57mm of reach.

Good luck.
re: Modern brakes on older frameDebby
Sep 21, 2001 8:38 AM
Let's try that again...Debby
Sep 21, 2001 8:42 AM
What I had meant to say was that newer brakes are mounted with recessed bolts. Older bikes
(not sure when the change was made) had brakes that mounted with a longer bolt and nut.

I know this isn't an answer to your question, but just something to check out.

Good luck,

Debby
mounting brakes...Andy M-S
Sep 21, 2001 9:12 AM
It's easy to modify a bike that is set up for external nuts; I forget the exact diameter, but a power drill and a standard pack of bits should be all you need to handle this situation...
re: Modern brakes on older frameJohn Jagela
Sep 21, 2001 9:45 AM
Try Harris Cyclery-they sell specially made 'drop bolts' which allow the usage of modern brakes on old frames.
Their website can be found at sheldonbrown.com
Best of luck.
just did itbianchi boy
Sep 24, 2001 10:50 AM
I've got a 1985 Bianchi that I recently upgraded with an Ultegra group from another bike (a 1999 Bianchi). The brakes fit fine, although my mechanic had to hunt around the shop for some bolts to attach the new brakes to the old frame and fork. The reach was perfect, though.

To get a rough idea about whether it will fit, measure the reach from the brake pivot to the pads and the rims on both bikes/brake sets. Use a bike shop that's been around awhile and is likely to have old parts lying around.