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Recreational Cyclocross and Gravelbiking This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like :The Dirty Kanza". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

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Old 02-06-11, 05:29 PM   #1
Watchdog
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CX wheels with disc brakes

I was thinking I'd like to get a CX bike (dreaming) with disc brakes to use as a commuter and also for some road riding. Because it would be a multi-purpose bike I'd like to get an extra set of wheels.

Looking at a number of forum sponsors I don't see anyone selling 700c wheels with hubs that accept disc brakes, at least not in the 130 mm spacing for the rear hub. I see 29'er wheels but as I understand it, those wheels will not work since they are 135 mm spacing.

So is the only alternative to get some custom wheels built? Obviously there must be some 130 mm rear hubs what accept a disc brake since bikes are being sold that way, but it's hard to find the wheels.
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Old 02-06-11, 06:14 PM   #2
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I've yet to see a 130mm disc brake hub. I am sure they're out there but they are extremely rare.
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Old 02-06-11, 07:15 PM   #3
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Velocity makes them. You can respace DT 240s and Chris King ISOs as well, though they are much more expensive.
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Old 02-06-11, 09:27 PM   #4
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How about these?
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Old 02-06-11, 09:33 PM   #5
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Thanks guys.
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Old 02-07-11, 12:25 PM   #6
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The other thing you can do is get a CX bike with 132.5 or 135 rear spacing, which are quite common, especially amount bikes that are good for commuting. The Soma Double Cross DC comes to mind. In fact, I'm not sure I know of a disc-ready CX frame that has 130mm rear spacing.

Yet another option is to put a disc fork on a non-disc CX frame, so you've got a disc brake up front and cantis in the rear. I just did this with my Kona Jake, and I'm really liking this setup for commuting. The bike is still fairly light (about 8 pounds lighter than my old disc-equipped commuter) and I don't have to worry about the rear wheel spacing thing.
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Old 02-07-11, 01:35 PM   #7
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Wouldn't flexing the rear triangle create alignment issues with the disk mount?
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Old 02-07-11, 02:14 PM   #8
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Wouldn't flexing the rear triangle create alignment issues with the disk mount?
In which case?
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Old 02-07-11, 02:26 PM   #9
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For a 132.5 spaced frame.
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Old 02-07-11, 02:34 PM   #10
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I've read a few posts here on BF where people stretched a frame to put 135 hubs on and the discs worked just fine for them.

I agree with Andy though, if you can find a 132.5 frame, that would be ideal. Probably more common than a 130 I would think. Mine is 132.5.
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Old 02-07-11, 05:50 PM   #11
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For a 132.5 spaced frame.
I can see how potentially, that would be troublesome, although apparently Soma isn't worried about it. As long as you spread the frame the same way every time, it would line up. But I definitely see your point.
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Old 02-08-11, 11:27 AM   #12
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I can see how potentially, that would be troublesome, although apparently Soma isn't worried about it. As long as you spread the frame the same way every time, it would line up. But I definitely see your point.
Spreading a frame 2.5mm to acommodate a hub is nothing to worry about. That's why Soma isn't concerned about caliper and disc alignment on their DCDC frame. Think about it... you're spreading the frame about 1.25mm on each side. Do you realize how far 1.25mm is?

Besides that... it's the orientation of the hub and the caliper to one another that matters... not the distance between the dropouts. The only way that you'd have a disc alignment problem is if you spread the stays so far that the caliper mounting angle changes dramatically. And 1.25mm (half of the 2.5mm total spread) is not even close to making that happen. Your steel frame would be popping welds long before you reached the caliper misalignment stage.

Last edited by Hydrated; 02-08-11 at 11:28 AM. Reason: Typo
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Old 02-08-11, 11:52 AM   #13
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$100 hubs disc 700c 130mm: http://cgi.ebay.com/Novatec-D351SB-D...#ht_1661wt_905

$270 disc wheelset: http://bikeisland.com/cgi-bin/BKTK_S...ls&ProdID=1554

I'm flirting with the idea of building up a pair with the hubs listed above and white velocity aeroheads to match my tape and saddle. hmmmm.
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Old 02-08-11, 01:24 PM   #14
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Quote:
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Spreading a frame 2.5mm to acommodate a hub is nothing to worry about.
Yeah, you're obviously right. I was thinking a couple of millimeters is enough to get the rotor to rub the pad annoyingly, and you may spread each dropout 1.25 mm one day but spread one 2mm and the other 0.5 the next day. But since, as you point out, the distance from the rotor to the left dropout is independent of how the dropouts get spread, this clearly isn't an issue.

Never mind.
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Old 02-08-11, 02:17 PM   #15
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I have a non-disk Poprad that has the 132.5 spacing so I know that it's not an issue with the hubs (I actually love this option). I don't have anything with a disk so I'm really unfamiliar with them and the tolerances.
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