You may well remember Berd's very different take on the mountain bike wheel, that we
reviewed in 2020. The XC33 wheels had an impressive weight and offered a compliant ride. No surprise, really, considering the spokes were made of what appeared to be string.
Now, before you think it, using a flexible, string-like material is not about the ease of sourcing replacement spokes or letting your kitchen scissors do the talking in your wheel builds, but rather it comes down to compliance and weight. In fact, Berd claim that using ultra-high molecular weight polyethylene spokes means that they can make them lighter, more comfortable and more durable. It's also worth noting that despite the space-age looks, the hub and rim are compatible with normal spokes.
Berd Hawk30 Details • Intended use: trail / enduro
• Carbon rims, 28 polyethylene spokes
• Industry Nine Hydra hubs
• Internal rim width: 30mm
• Claimed weight: 1394 grams
• Made in North America
• Price: $2,195 USD
•
berdspokes.com Following their XC wheels, Berd added a burlier Hawk27 model and now releases an even wider rim with impressive weight claims. The Hawk30 wheels have a 30 mm internal rim width and, much like its predecessor, is built in conjunction with We Are One Composites. Berd is keen to stress, however, that these are Berd rims designed by them and using their own molds, and not just a rebadge of another brand's model. The rims also use a 3.75mm rim lip to hopefully prevent both pinch flats and rim damage.
The rims are 18mm deep, which certainly makes them one of the shallower options available. A shallower rim will let the wheel compress more and, when coupled with the unique spoke design, could potentially yield gains in terms of comfort and grip. Even if it comes at the cost of stiffness for some riders.
Berd offers a lifetime crash replacement service and says that if the rim does need to be replaced, it will be free of charge. The rim itself has a claimed weight of just 393 grams. The rims have a recommended tire width of 2.4 to 2.7" and will be available in Boost and Superboost, although only in 29". They're Centerlock only.
Berd provided some data for their claims, although without knowing the model of the competitor's rims it's not as useful as it could be.
When the wheelset is built with Industry Nine Hydra hubs, they have a claimed weight of 1,394 grams. For a wheelset that can supposedly handle the rigours of enduro riding, that's quite remarkable considering Berd say the rims are light enough for XC racing as well as rougher enduro runs.
The wheels, which are entirely made in North America, have a retail of $2,195 USD and are available now in limited quantity. Berd say they will ship the remaining orders in 4 - 6 weeks.
1394g though. That is impressive and that is a performance benefit.
My WAO carbon wheelset is as true as they were out of the box after a year of lots of hard riding. Saving $120 in rims every six months (and build time/cost and usually nipples/spoke purchase too) makes up for the added cost of lifetime-warranty-carbon pretty quickly.
There is a lot of truth in this, even if the numbers you're saying might not be what everyone else is seeing for AL rims lifespan.
But the current truth seems to be that for enduro type riding, Carbon rims aren't usually going to save you much/any weight over an aluminum set. But the carbon ones will likely have less maintenance.
Of course, the failure modes are different. If a carbon rim goes, its usually catastrophic. But from what I've seen so far, it seems that the forces needed to break a good carbon rim seems to be higher than the forces it would take to fairly significantly damage a good AL rim.
Its only an anecdote. I'm ~190lbs, and like to go my version of fast. My old AL rims accumulated dents, and even when keeping an eye on spoke tension regularly, they only lasted 2 years. I got a set of WAO Unions, and have been on them for almost 2 years now. They are still dead straight.
I prefer lower tire pressures (~24-27 PSI), but I also run dual cushcore. Not going to set any uphill records - but the wheels feel bulletproof.
but still gave me a crash replacement. On carbon rims where the strength is focused on the sidewalls and the channel can be ultra thin, the problem is even worse.
Not everybody (I don't understand why but I heard it is 'a thing') has more than one bike so that they have one to ride ride whilst the other one's parts are getting fixed/ replaced.
I'll check out Bike brain! thanks!!!
I built an enduro wheel set of 450g BTLOS rims, Dt Swiss 350 hubs, 32 berd spokes for about $1500 pre covid prices
They weigh 1600 with strips and valves and I trust them completely for hard riding.
Berds are the real deal.
Oh and Rolf can't just get you a new rim. You basically buy the whole new wheel! Don't buy Rolfs used, or maybe at all?
Example: "I've been mountain biking without injury for years"
Sounds like I'm pretty good. But if said I started riding 3 years ago and am injury free sounds much different.
#captainpedantic here
It's not that hard man.
Plus riding for 3 years straight with absolutely no injury is pretty decent in my book ha.
Wheels: 5 years against manufacturing defects
Crash replacement: the damaged Berd wheel will be replaced or repaired to new condition for $200 for the period of 5 years from the date of purchase
Customer is responsible for labor and shipping for all crash replacements
So, I guess I ll go spend my kidney somewhere else...
https://www.youtube.com/watch?v=viCQQRd80iM
Dont see why you would need special tools to true these ( you need 2 small wrenches ( tire on) or 1 whrench and a screw driver( tire off) ....just need a hammer...kidding. Berd has a video and they use a standard parktool spoke tension tool.
Pirope has been making textile spokes for a few years now and i keep hearing good things about their wheelsets.
pirope.net
Their 1480g Enduro/Trail wheelset isn't any less expensive, though.
1) you need to use dm20 Dyneema it doesn’t creep…a commercially available source is rob line oceanstat20 2mm
2) you need a little extra spoke thread to account for settling of the splices
3) you need to retention about 4-5 times from initial build as splices compress
4)glue or lock stick his splices to prevent slipping when loaded dynamically
They weigh 1445g in 27.5" with a Newmen 30mm alloy rim.
They have seen a lot of trails, bikepark, jumps und downhills and they are straight like on the first day.
But the best thing about them is not the weight (it´s also great), it is the riding behavior. They feel stiff and precise but at the same time much more damped, with better traction and less vibration in the bike than with traditional spokes.
I love them.
In my opinion the Pirope Wheels are nicer made than the Berd wheels with with the spokes knotted to the hub. But with Pirope you need their special hubs (made by Newmen).
When I had my WA1 Unions laced with these spokes I thought it'd be a fun experiment to test the vibration damping claims. I could feel it the first moment I got on trail. I kid you not. I was shocked. It wasn't typical bike industry marketing garbage. Kudos, Berd.
Ordered the Hawk 27 wheel set for my XC/downcountry and a set of these for trail and light enduro. Stoked!
If have the cash when I need another wheelset, this will probably be it.
Tell Wayne Lee... the owner that I sent you
My brain hurts
Aren’t wheels just a beautiful equilibrium.
I wonder when it flipped or the benefits of supporting spokes are greater than their weight? Thinking car / cart wheels
100% agree with bend it don’t break it approach. In addition to allowing I to get out of the way of impacts better
The flexible spokes allow the wheel to deform more while still holding spoke tension under larger compressive rim loading.
This keeps the rim better supported against lateral buckiling (taco) when impacted in radial/lateral directions that can cause metal spokes to go slack
If you try to flex most shallow bare rims they have tons of flex so are capable of moving much farther than most spokes would allow without risk of rim failure…as such a strong more flexible spoke allows the system to work better and bend without breaking
Is it easy to change a string-spoke?
And if one breaks, how does manage the wheel? Is the behavior similar to a wheel with a regular broken spoke?
I should have gone with center hub. I might just remove the internals of my onyx to reduce the weight and buy the centre hub.
I also think it's still a lighter system weight overall, but may depend on the rotor.
Sorry Henry. That is 100% incorrect. You need to read "The Bicycle Wheel" by Jobst Brandt where he discusses this from both the theoretical view and backs it up with testing.
Or take a class in engineering. The tension in the bottom spokes decreases under load. It is that decrease in tension that supports the weight of bike and rider. The top spokes don't do anything.
I do think, however, in the context of this article regarding these string-like-spokes, my example does serve to illustrate a point about how these wheels work.
Thanks for reading and the reading suggestion - genuinely - and it just goes to show what amazingly complex bicycles are, even in their most tried and tested formats.
It is true that the tension in the upper spokes does not increase when you load the wheel. This force is immediately transferred to the rim, which is pushed against the ground, where it deforms and allows the lower spokes to release some of their tension, bringing the forces at the hub back to equilibrium. So it's the lower spokes that change tension on load.
That doesn't mean the top spokes are not responsible for keeping the hub up. The main change is that the (equal) upward force that the upper spokes generate, is countered by the downward force on the hub plus the (reduced) tension in the lower spokes, leaving a net force of zero so the hub stays where it is. IMO it's pretty far fetched to describe that situation, as Brandt does, by the sentence "he wheel stands on it's spokes". As I see it, the upward force is generated by the top spokes, but you need all the spokes and the rim to distribute the load in this way.
www.youtube.com/watch?v=w4kz0k4AdI4
Due to the cross partern it's actually the spokes either side of 6 o'clock which increase in tension first, according to this model.
I also recall lots of issues with slipping free hubs on Onyx, have they sorted this out?
In all seriousness, I actually like buzzy hubs because it does a meaningful job of alerting other trail users to my presence - avoids the need for rackety sleigh bell on your bike.