Author Topic: Nomad Mk3 confusion?  (Read 175 times)

kwkirby01

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Nomad Mk3 confusion?
« on: March 28, 2020, 05:18:23 PM »
I've been looking at the new Nomad Mk3 brochures (not that I can afford a new bike just now, but there's no harm in looking!)

The NOMAD Mk3 ROHLOFF 650b brochure states:
Quote
With 650b wheels there is only the option of having disc brakes front and rear, using the Thorn Mk3 Steel disc fork, which takes a 110 x 15mm BOOST through axle.

However, the THORN NOMAD Mk3 AB Special clearly shows a picture of a 700c Nomad with V-brake forks and reversible brake bosses, suggesting that it would indeed be possible to have a Nomad with a front V-brake and 650B wheels.

Is there a technical reason why this wouldn't work?

Kevin

Kevin K. Glasgow

spoof

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Re: Nomad Mk3 confusion?
« Reply #1 on: March 28, 2020, 06:58:55 PM »
Hi Kevin,

The Nomad MK3 AB Special uses a different model of fork, same as the Mercury 853 V-brake fork. The forks in the brochure for the 26" and 650B Nomad MK3 models are different and sold as either v-brake only, or disc only 'thru-axle' choice I believe. A quick look at the MK3 26 inch model forks for v-brake only on their website (link below) they do advertise reversible v-brake bosses for 26" and 650B compatibility so my thoughts are you can run v-brakes with 650B with suitable 650B rims and adhere to the max tyre width for a build.

I think this is right, hope it helps.

Kyle

Fork link https://www.sjscycles.co.uk/forks/48-offset-a-650b-26-inch-thorn-nomad-mk3-steel-fork-gunmetal-imron/

kwkirby01

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Re: Nomad Mk3 confusion?
« Reply #2 on: March 28, 2020, 08:42:31 PM »
Thanks Kyle, similarly, these forks are v-brake and stated as 650B/700C and Nomad compatible:

https://www.sjscycles.co.uk/forks/46-700c-650b-thorn-mer853vc-steel-fork-gunmetal-imron/

Either way, it's not clear why a Nomad Mk3 650B should be front and rear disc brakes only.
Kevin K. Glasgow

PH

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Re: Nomad Mk3 confusion?
« Reply #3 on: March 28, 2020, 10:21:11 PM »
Does seem a little odd for them to be selling a 650B rim brake fork and saying the complete bike is disc only, there might be an obvious answer but it hasn't occurred to me.
The 700c AB brochure also has an oddity, the fork on the pictured bike isn't the one in the description, maybe they were experimenting.
So - Even though you're just looking, which would you go for?

kwkirby01

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Re: Nomad Mk3 confusion?
« Reply #4 on: March 28, 2020, 10:55:28 PM »
Given the way I cycle, I know my current front v-brake will support an effective emergency stop in all conditions I would choose to cycle in, so I don't need a front disc brake.

If v-brakes are adequate, perhaps it be easier to have them front and rear (the Nomad frame supports this see the 26 Nomad in the latest mega brochure, which looks a lot like my current Sherpa).

That said, the disc fork can handle larger tyres to match the rest of the Nomad frame, but do I need tyres which are bigger than the 50mm supported by a v-brake fork? Would an extra 10mm (i.e. 60mm tyres) add significantly to comfort?

The disc fork looks purposeful and seems to suit the Nomad, but the simple, straightforward lines of the 853 fork appeal too.

In answer to your question PH, I'm not really sure!
« Last Edit: March 28, 2020, 10:59:37 PM by kwkirby01 »
Kevin K. Glasgow

PH

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Re: Nomad Mk3 confusion?
« Reply #5 on: March 29, 2020, 04:28:28 PM »
Given the way I cycle, I know my current front v-brake will support an effective emergency stop in all conditions I would choose to cycle in, so I don't need a front disc brake.
I don't need disc brakes either, so with my Mercury I went for the 853 V brake fork and a cable disc on the rear. I have no issues with that, it's a lovely bike.
BUT
Having since got a work bike with hydraulic disc brakes, it's what I would have chosen now.  The much talked about comfort difference is lost on me, with the same 35mm tyres I can't tell the difference.  They win when it comes to ease of maintenance and lack of adjustment.  And although I've always stopped fine with V's (Or cantis or calipers) there is something nice about just needing a gentle squeeze to do so.
The argument about repairability in the field is as relevant as ever, or not if it doesn't apply to your usage.

spoof

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Re: Nomad Mk3 confusion?
« Reply #6 on: March 29, 2020, 04:47:00 PM »
Hi Kevin,

The v-brake nomad forks linked to previously support tyre widths beyond 50mm so they will be more than fine if you want to change tyres and go slightly wider, though like mine during removing and replacing, the tyre has to be mostly deflated to get the tyre past the brake blocks. The forks support tyres widths of 26 x 2.35" (60-559) and 60B x 650B (60-584) tyres and that is said to be the maximum using mudguards applied to fork. Removing the mudguard maybe the fork will run even wide tyres likely. I do get confused all the time with tyre measurements etc but in metric terms all around 60mm wide for either size tyre/rims I believe.

There is a short but great write up on page 44 of the Thorn Mega Brochure by Andy Blance who experimented and compared heavy duty forks running the disk brake vs the v-brake for comfort etc. His findings are very interesting indeed. After reading it, I think that maybe led onto Thorn deciding to increase the axle width for their disk brake fork option to 15mm thru axle possibly? The wider axle I presume is stronger, more rigid etc. A benefit I read about the thru axle is that they help align the disk rotor near identically between the brake pads when removing / reinserting a wheel eliminating any variance that can cause rotor rub on the pads.

Thorn Mega Brochure here: http://www.sjscycles.com/thornpdf/thorn_mega_brochure.pdf

Kyle

Pavel

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Re: Nomad Mk3 confusion?
« Reply #7 on: March 30, 2020, 09:20:49 PM »
Does seem a little odd for them to be selling a 650B rim brake fork and saying the complete bike is disc only, there might be an obvious answer but it hasn't occurred to me.
The 700c AB brochure also has an oddity, the fork on the pictured bike isn't the one in the description, maybe they were experimenting.
So - Even though you're just looking, which would you go for?

Perhaps there now is one or two, but thus far I've never seen a 650B rim that was meant for V-brakes, so perhaps the lack of rims is why 650B is considered disk only?

PH

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Re: Nomad Mk3 confusion?
« Reply #8 on: March 30, 2020, 10:00:27 PM »
Does seem a little odd for them to be selling a 650B rim brake fork and saying the complete bike is disc only, there might be an obvious answer but it hasn't occurred to me.
The 700c AB brochure also has an oddity, the fork on the pictured bike isn't the one in the description, maybe they were experimenting.
So - Even though you're just looking, which would you go for?

Perhaps there now is one or two, but thus far I've never seen a 650B rim that was meant for V-brakes, so perhaps the lack of rims is why 650B is considered disk only?
Good point and not one I'd considered - So I looked at what SJS stock and although most are disc, 6 of the 36 650B rims are suitable for rim brakes
https://www.sjscycles.co.uk/rims-650b-275-584/?type=rim+brake

mickeg

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Re: Nomad Mk3 confusion?
« Reply #9 on: March 30, 2020, 11:36:09 PM »
650b wheels were used for decades before disc brakes were created.