Stans CB7 Grail Pro.. anyone try them

Especially for light weight issues concerning cyclocross / touring bikes & parts.

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spdntrxi
Posts: 2777
Joined: Sat Jul 20, 2013 6:11 pm

by spdntrxi

25-40 tires size
low weight..300g rim
might be flexy is my only concern...


Really want Enve G23's might those might to too specialized with min tire size 35c..I'd like to have some options for going on different bikes to reduce the # of wheels hanging from my rafters.

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wheelsONfire
Posts: 2750
Joined: Mon Jul 07, 2014 8:15 am
Location: NorthEU

by wheelsONfire

Exactly what i read in a review, they're more flexy than many others.
Bikes:

Ax Lightness Vial EVO Race (2018.12.21)
viewtopic.php?f=10&t=156137
Paduano Racing Fidia (kind of shelved)
Open *UP* (2016.04.14)


Ex bike; Vial EVO D

by Weenie


psuambassador
Posts: 32
Joined: Wed Jun 22, 2011 2:20 pm

by psuambassador

I'll let you know. I just built a custom set with the Grail CB7's with DT Swiss 350 hubs and Sapim Laser spokes. Got the set down to 1218g.

spdntrxi
Posts: 2777
Joined: Sat Jul 20, 2013 6:11 pm

by spdntrxi

psuambassador wrote:
Fri Jan 18, 2019 2:05 am
I'll let you know. I just built a custom set with the Grail CB7's with DT Swiss 350 hubs and Sapim Laser spokes. Got the set down to 1218g.
nice..350;s are not even lightweight,,

grooveninja
Posts: 15
Joined: Fri Dec 14, 2018 3:33 am

by grooveninja

I built them w/ 240 centerlock and CX-Rays, a little over 1200gm/pair. Since I have a 45 & 37c tire, it's a bit harder to tell if they are flexible compared to a 23c road tire, but for gravel, so far, super happy! I originally built them for my wife (130lbs), but I've been riding them on my Stigmata CX bike on intermediate XC trails without issues.

TheKaiser
Posts: 632
Joined: Thu Sep 05, 2013 3:29 pm

by TheKaiser

Regarding flexiness, Stan's lightests aluminum rims were cerainly pretty flexy, in all directions, however they claim the CB7 is 3x stiffer laterally so I wouldn't worry about lateral flex on the CB7. Regarding radial stiffness, Stan's does claim to have engineered in flex, more so than other carbon rims, both to help the rim survive sharp impacts, and to smooth out the ride. Here is a vid you might not have seen which is them demonstrating that flex on a mountain bike rim:
https://www.youtube.com/watch?v=YWW1fPHnK1k

Most wheelbuilders will tell you that you never want spokes to de-tension as seen in this video, so to think that the rim should/will be flexing this much routinly is erroneous or misleading. Many of them will also make the point that you can't separate lateral/radial flex as once the spokes lose their tension due to a radial impact they can't support lateral loads either.

However, I can imagine a bit of a middle ground where the more radially flexible rim is slightly more compliant, while still staying within the spoke's elastic limits, keeping them somewhat tensioned and thus benefiting from the compliance without losing lateral stiffness. Also, on a catestrophic impact, I think that a detensioning of the spokes and distribution of force through a greater portion of the rim is preferable to a more rigid rim that cracks at the point of impact. All in all, I think they are one of the more interesting designs out there and I'd be happy to ride them. I'd need to take price relative to other options into account before actually buying them, though.

moyboy
Posts: 402
Joined: Thu Aug 18, 2016 12:19 am

by moyboy

Thinking of this rim too, maybe to extralite spd-2. How do the spd-2's handle the dirt?

by Weenie


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