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Old 04-02-12, 01:29 PM   #1
Ground Hog
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Can't find 650b road rims with machined braking surface

Does anyone know of a 650b rim that has a machined braking surface? I have looked at Velocity's 650b Synergy, Blunt and Dyad rims as well as Grand Bois, Velo Orange and Hand spun rims, and none of them offer a machined braking surface at this time.
Does anyone know why?
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Old 04-02-12, 02:12 PM   #2
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Have you considered using 650c wheel/rim which is bascically the same size in road type with braking surface.
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Old 04-02-12, 02:45 PM   #3
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Why?, because it is not that important. Have pinned rims that don't get machined brake tracks
on 25 year old bikes ..


ride with some really abrasive brake shoes, in the rain for a few months,
and they will grind out any surface finish.
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Old 04-02-12, 02:50 PM   #4
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Originally Posted by zukahn1 View Post
Have you considered using 650c wheel/rim which is bascically the same size in road type with braking surface.

Uh, there's a world of difference between 650B and 650C. Try putting the smallest width 650B tires on the widest 650C rim, and get back to us on how that worked out. ;-) Not to mention that 650C is 571 mm and 650B is 584mm.
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Old 04-02-12, 04:22 PM   #5
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A Velocity dealer may be able to have them machine sidewalls on either the Synergy or Dyad rims if you're willing to wait, and pay a small upcharge.
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Old 04-02-12, 04:53 PM   #6
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Why?, because it is not that important. Have pinned rims that don't get machined brake tracks
on 25 year old bikes ...
+1 There's no practical need for machined rims that I can see. Plus, they'll last a bit longer before the brake track wears through.
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Old 04-02-12, 04:58 PM   #7
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The only advantage to machined sidewalls is that if the rims are color or hard anodized or otherwise painted the pads don't mar the colored surface - the machining has removed it for you.
I had a pair of wheels with Mavic MA-40 (I think) hard anodized rims in the late '80's; they looked fine out of the box, but a few hundred miles later the sidewalls looked just plain nasty from the hard anodizing wearing off at the brake track. If they had been clear anodized or polished aluminum they would have looked quite spiffy.
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Old 04-02-12, 08:16 PM   #8
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I was under the impression that a machined sidewall provided better braking?
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Old 04-02-12, 08:24 PM   #9
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The only advantage to machined sidewalls is that if the rims are color or hard anodized or otherwise painted the pads don't mar the colored surface - the machining has removed it for you.
I had a pair of wheels with Mavic MA-40 (I think) hard anodized rims in the late '80's; they looked fine out of the box, but a few hundred miles later the sidewalls looked just plain nasty from the hard anodizing wearing off at the brake track. If they had been clear anodized or polished aluminum they would have looked quite spiffy.
I still have some MA-40s from back then. I think they look kinda cool with the worn spots alternating with the spokes. Separates the poseurs from the real racers when you see them at Starbucks!
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Old 04-02-12, 08:25 PM   #10
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I was under the impression that a machined sidewall provided better braking?
Perhaps in the wet, maybe. In the dry, the ultimate limit to braking-power and distance is the rider's ability to modulate the brakes to keep the rear-wheel barely on the ground. Any rim will give more than enough friction to throw you over the bars.
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Old 04-02-12, 08:51 PM   #11
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I would consult with some local machine shops; it should not pose much of a problem for them to machine any rims, or built wheels for that matter, that you would like.
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Old 04-02-12, 09:17 PM   #12
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Have you tried Anthony @ longleaf bicycles? He shows 650b 32h Dyads w/MSW.
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Old 04-02-12, 09:22 PM   #13
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http://sheldonbrown.com/brandt/machined-rims.html
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Old 04-03-12, 06:21 AM   #14
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I still have some MA-40s from back then. I think they look kinda cool with the worn spots alternating with the spokes. Separates the poseurs from the real racers when you see them at Starbucks!
Or identifies the old guys I have a pair and no one would confuse me with a racer.
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Old 04-03-12, 01:26 PM   #15
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+1 There's no practical need for machined rims that I can see.
Compared to a non-machined rim which has not broken in machined brake surfaces lack the annoying tick that may go with the non-machined joint and with anodized rims the machined surface works better in wet weather.

In places with lousy wet weather that eats rims you won't be stuck with that long. In dry spots in could take a while.

Living in an alpine desert my MA40s sucked until I got enough winter miles on them.

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Plus, they'll last a bit longer before the brake track wears through.
In dry spots that can take a very long time with light machined extrusions.

Last edited by Drew Eckhardt; 04-03-12 at 01:30 PM.
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Old 04-03-12, 01:48 PM   #16
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Harris cyclery or Rivendell?
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Old 04-03-12, 08:05 PM   #17
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SOmebody said the advantage of machined walls rims. just use what ever you have on hand dude. Machined rims came up the last 10 years maybe?? before than that everybody was using non machined and we did not complain about it since the beginning of times
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Old 04-03-12, 08:25 PM   #18
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Universal Cycles built my 650B wheels with Velocity Synergy rims, and they had machined sidewalls. Amazingly enough, the front rim has a slight blip at the seam that I can feel when braking.
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Old 04-03-12, 09:31 PM   #19
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SOmebody said the advantage of machined walls rims. just use what ever you have on hand dude. Machined rims came up the last 10 years maybe??
Mavic Reflex clinchers date back to at least 1996.

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before than that everybody was using non machined and we did not complain about it since the beginning of times
We also

1. Didn't use anodized rims which have poor wet weather braking when not machined

2. Didn't unnecessarily weld the rim joint or crimp it at its ferrule (the joint is being closed by 1000 pounds of pressure and isn't going anywhere) thus making a bump which needs to be removed (or worn off) for smooth (or even safe in extreme cases) braking.

A retro (or inexpensive) rim will be fine without both. One that partially adopts the modern "features" may not be.
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Old 04-03-12, 10:11 PM   #20
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Quote:
Originally Posted by Ground Hog View Post
I was under the impression that a machined sidewall provided better braking?
Perhaps in the wet, maybe. In the dry, the ultimate limit to braking-power and distance is the rider's ability to modulate the brakes to keep the rear-wheel barely on the ground.
That's precisely why the machined surface is better: increased uniformity means better modulation. Although of course there's not a lot in it.

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I still have some MA-40s from back then. I think they look kinda cool with the worn spots alternating with the spokes. Separates the poseurs from the real racers when you see them at Starbucks!
+1, my hardox Sun Mistrals look badass.

Last edited by Kimmo; 04-03-12 at 10:16 PM.
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Old 04-04-12, 07:02 AM   #21
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Living in an alpine desert my MA40s sucked until I got enough winter miles on them.

In dry spots that can take a very long time with light machined extrusions.
You're right, but the MA40's braking issues can't be projected to most non machined rims because the MA40 used Type III hard anodizing. It's slicker and much, much tougher than the Type I used on most bike parts and wheels.

For OP, non-machined is really a non issue because, thankfully, his choices are not hard anodized.
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Old 04-04-12, 07:58 AM   #22
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I was under the impression that a machined sidewall provided better braking?
They make brake squealing less of a problem on new bikes.
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Old 04-04-12, 09:36 AM   #23
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You can find what you need at ebay, seen a few in there. Or change to 700
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Old 04-04-12, 10:49 AM   #24
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Mavic CD hard anodizing went away smoothly, from the brake track
when I fit the alternate green compound brake pads
on my Magura HS33 Hydraulic rim brake equipped bike with their EX721 rims.
took a few weeks, in the winter, of down hill braking, in town.
now it's got the Red, Kool Stop Magura brake pad.
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Old 04-04-12, 10:54 AM   #25
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Quote:
I was under the impression that a machined sidewall provided better braking?
OCD, expressed in bike parts, strikes again..

if you built up wheels with what you could find , you could already be riding,
and form your own impression.

I doubt the difference is Night and Day, it rarely is .. perhaps 0.05%

Last edited by fietsbob; 04-04-12 at 10:58 AM.
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