650b on 26" frame - promax p-1 brakes

[chintan jadwani]

Has anyone tried the promax p-1 v-brakes on a 26" to 650b conversion?

They have about 35mm of vertical brake pad adjustment so probably they should work...

From what I read, they are similar (cheaper and less premium) to the box three v-brake.

[Josh Zielinski]

Yes I have used them for this purpose on '89 Trek 950. 

Originally, had Tektro cantis (CR720s) which looked great but they worked only ok due to where I could get the pads to align on the rim.  Swapped in these Pro-Max v brakes (108mm, silver version) and the braking dramatically improved as they offered better range to get pads in better position, plus v brake leverage/power.

These are a great option.  Highly recommend.

Josh Z

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[Rudy Faust]

Yes, I'm using on a 1990-ish (non-U-brake era) Diamond Back Ascent basket bike. I haven't shredded with it, but they stop my schlubby self and cargo with aplomb. I imagine that it will be even better when I get around to Kool Stops

RF

[Will Boericke]

I built a 650b on 26 Trek 850 frame with the Chinese version (maybe the same thing?).  They worked really well.  Granted, I sold the bike pretty quickly.

Will near Boston

[Will Boericke]

I am skeptical of the wheel-size-dramatcially-affects-geometry argument.  I can only argue from analogy - my gravel bike wears 700x42 normally, but I am equally happy on 650x48.  Crank strike is more of an issue, but I just watch out for that and use crank boots.  BB is definitely lower, but I honestly don't really notice.  I notice no difference in handling, other than maybe slightly snappier steering.

Will

On Wed, Aug 28, 2024 at 11:04 AM Bernard Duhon <ber...@bernardduhon.com> wrote:

 

 

 

 

I have a 26 inch Waterford built touring bike (similar to a Riv Atlantis before they went all in on the long chain stays)

 

650b will fit and the  XTR v brakes will work. Richard Schwinn mentioned that it would alter the steering and mildly recommended against it.  The bike was designed for a 26 X 1.6 inch tire.  I have a chart that shows the difference in will circumference is just a few millimeters. 640mm V 670mm.  However we know that just a few millimeters change of frame geometry is a big deal.

 

Other than availability of tires/fendors (can’t fit larger than actual 26 X 47 mm tire)  

 

what advantage do you see on either the handling/speed/bump roll over of the changeup from's 26 to 650 B

 

thank you,  ye of more experience than I.

 

 

 

Yours sincerely,

 

Bernard F. Duhon

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[Josh Zielinski]

I second this opinion.

I have altered the wheel size on 4 bikes and only ever found more pleasure in the wheel size adjustment: that is, I got all the intended benefits that new size offered with minimal issue.

My 26" to 650b bike (others were/are all 700c to 650b) handles better to me than it did originally.  I'm slightly higher up (as is BB) but to me it feels better--like the bike should have had that size wheel all along.  I especially like it off road/on trail.

If you have a wheelset laying around I'd highly recommend exploring.  Of course, things don't always work as planned so be ready for that too (has happened to me a couple times).  I think people over think this a bit in general--bikes are just for fun you know?

Josh Z

Oregon 

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[Bernard Duhon]

 

 

 

For sure when I did a 700 C X 25mm to 650b 38/42 mm I noticed no difference

 

 

 

Yours sincerely,

 

Bernard F. Duhon

[chintan jadwani]

Thanks to all who responded :) 

Haven't made an order yet, but found a deal on the promax brakes here if anyone is looking to try them..

chintan