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Canti and 650a/650b conversion

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Canti and 650a/650b conversion

Old 08-17-14, 11:30 AM
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Canti and 650a/650b conversion

I've decided to convert my '85 Schwinn Cimarron from ISO559 (aka 26") to ISO590 (aka 650a, 26 x 1 3/8); and want to keep canti brakes. I recently stumbled across these: ELEVN technologies || BMX Brake Adaptor which move the posts 16mm. Perfect, because (590-559)/2 = 31.5 not, should be 15.75

They arrived yesterday, I cut off an ground down the original post (they are not the removable type), then drill and tapped the stubs for M6x1. A stainless steel Grade 8.8 M6x1 button head cap screw with a stainless steel washer replaces the M10 bolt provided by Elven. They fit perfectly.

Thinking about it, I realized that (622-590)/2 = 32 590 is almost perfectly halfway between 559 and 622.

These should also work well for ISO584 (aka 650b) conversions from 622 or 559 with any post brakes (canti, U, V)

Last edited by nfmisso; 03-06-15 at 11:40 PM.
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Old 08-17-14, 11:34 AM
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I think you mistyped that one equation above: (590-559)/2 = 15.5, but were on the right track. That's a cool adapter for conversions.

650A/B is the perfect middle ground between 26" and 700C. How is your bike working out?
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Old 08-17-14, 01:18 PM
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Yay Maths!

also cool product… its like a drop bolt for cantis. Cue someone with an ad from 1953 showing that MAFAC made something similar.
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Old 08-18-14, 12:42 PM
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Originally Posted by ThermionicScott
I think you mistyped that one equation above: (590-559)/2 = 15.5, but were on the right track. That's a cool adapter for conversions.

650A/B is the perfect middle ground between 26" and 700C. How is your bike working out?
Teach me to do math on Sunday morning......

Should be 15.5 and 16 - duh....

So far, it is completely torn down, with the frame and fork modified.

Goal for October is to talk a local plater into electro-less nickel plating the frame and fork; then comes assembly.

Last edited by nfmisso; 08-18-14 at 10:04 PM.
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Old 08-18-14, 02:49 PM
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I'm glad to know this exists! Please tell us where to get it and how much it cost.
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Old 08-18-14, 10:03 PM
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Originally Posted by noglider
I'm glad to know this exists! Please tell us where to get it and how much it cost.
Hi Tom;
Brake Post Extensions Elevn Technologies $22.95 on sale, bought the last three they had.

MSRP is $24.95 New items from Elevn Racing | BMX Racing Group

Elven said that Dan's has them: https://www.danscomp.com/products-PA..._Extender.html

Pricey source: Elevn Brake Adaptors - $29.95 : Elite Bicycles, BMX - Fixies - Scooters - Parts & Accessories
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Old 03-07-15, 12:00 AM
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How did you do this (in more detail):

Originally Posted by nfmisso
I cut off an ground down the original post (they are not the removable type), then drill and tapped the stubs for M6x1. A stainless steel Grade 8.8 M6x1 button head cap screw with a stainless steel washer replaces the M10 bolt provided by Elven
700c = 622mm dia (311mm rad.)
650b = 584mm dia (292mm rad.)

delta = 19mm rad.

The "Elevn V-Brake Post Extender" moves the posts 16mm, and I feel confident my brakes can cover the extra 3mm.
https://www.danscomp.com/products-PA..._Extender.html

Last edited by Erik_A; 03-07-15 at 12:04 AM.
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Old 03-07-15, 10:01 AM
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Originally Posted by Erik_A
How did you do this (in more detail)............
Hi Erik;

The Cimarron's posts are brazed to the frame. The posts are hollow all the way thru. I cut the posts a couple millimeters above the base with a cut off wheel in my motor tool, then ground flat, smooth and to final dimension. I tapped the hole in the post M6 x 1.0 (size x pitch), the same size used for mounting cantis (and linear pull and U-brakes and ?). The couple millimeter off the original post above the base provided alignment for the ELVEN parts. IF you do this measure the ELVEN part carefully so that the remainder of the post sits below the bottom of the counter bore, but as tall as possible to provide the maximum amount of location purchase for the ELVEN part. Standard stainless steel button head M6 screws from McMaster have the same head diameter as the custom M10 screws ELVEN provides. I purchased two pairs of Problem Solvers posts of my Cimarron. My Cimarron is permanently changed from 559 to 584/587/590 (650b/700d/650a).

A bit about the pictures on ELVEN's and Dan's Comp websites.

ELEVN RACING | Brake Adaptators shows the parts as they come shipped to you. The custom M10 screws are threaded into the holes that your posts have to be threaded into. The custom M10 screws go thru the other holes, and are threaded into the bosses on your frame and fork - IF you have bosses that can be unscrewed (unlike my Cimarron).

https://www.danscomp.com/products-PA..._Extender.html The picture on Dan's Comp shows the complete final install on a bike with welded on mounts that posts would normally screw into. They have unscrewed the posts, installed the ELVEN parts, then screwed the posts into the ELVEN parts.

Use BLUE thread locker on posts and the screws. Do NOT use RED thread locker - you will need a torch to get things apart, which will ruin your paint. If you have an extra set of posts (Problem Solvers for example), you could use red thread locker to secure them to the ELVEN part permanently.
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Old 03-07-15, 11:49 AM
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Now we can get quality Rim brake hoops, this opens up a lot of possibilities for Mid nineties MTB frames with canti's. Although I have a set of cheap V brakes that have long enough arms and enough adjustment they should work on their own.
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Last edited by Fred Smedley; 03-07-15 at 12:01 PM.
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