Mavic Open Pro UST

Better late than never, we've gotten our first Mavic Open Pro UST rims. Since we've built just one set so far and it will get ridden for the first time on Saturday, there isn't a whole lot to talk about yet but here are some first impressions.

First, they're unique looking. "ISM4D" milling creates a unique profile, which leaves more metal at the spoke holes and removes it between them. The theory on this is weight minimization without leaving the spoke holes liable to cracking. The profile's waviness extends to the brake track on rim brake models, which you'll either like, not like, or have no opinion on. Also unique among more modern rims, the Open Pro UST has eyelets. Mavic claims testing that shows eyelets provide a bunch of spoke hole strength benefits, so time will tell on that one.


Graphics are understated and, to me, good looking. Very in keeping with the previous generation of Open Pro. Everything is removable if you're a black black black black black type of person. 

Width is 18.5 internal and 22 (max) external, and the depth is 25mm at the spoke holes. Claimed weight is 430g, which is actually somewhat more than the 409 to 415 range that we measured in ours. This will raise a lot of eyebrows, some to the good and some to the bad. For every "hooray, light!" there will be a skeptic that a rim so light can be durable. It's not a big rim, that's for sure. Stiffness through the build was quite good - actually surprisingly so - which we'll have to confirm on the road, but time will have to tell on durability. 

Slight smoke break here - congratulations for finding this page and thanks for reading. We'd like to offer you free US domestic shipping on any order over $100. Just use code "ilearnedsomething" at checkout. And now we return to our regular programming. 

We got one comment on our Facebook page that Open Pros set the standard for aerodynamic inefficiency, and have been the world's favorite wind tunnel punching dummy. An astute point, but the R-Sys is actually the wheel to use when you REALLY want yours to look good, and the Open Pro used, when it's used, is a 32 spoke wheel with straight gauge spokes. We know from our own testing that jumping from 20 bladed spokes to 32 straight gauge round spokes is going to be a pounding regardless of the rim use, and our testing came with thin gauge Laser spokes. Others have tested fatter, though not straight gauge, spokes and those show a much bigger loss than our tests with Lasers showed. The set here is 24/28, with CX Rays. My guess is that these aren't anyone's top choice for a TT, but my guess is also that they are no worse than the Shimano C24 which Tour Mag tested as down 13w to a Zipp 404. A gap, to be sure, but it may or may not matter to you. 

Pricing is reasonable, at $99 retail per rim. Margins are short until you buy a quadrillion of them, so for those of you who've been pounded over the head with our pricing methodologies (which includes you, if you're reading this), you shouldn't be surprised when build prices are in line with builds using rims with slightly higher retail prices. We're getting builds up ASAP. Subscribe to our email at the bottom of this page and we'll let you know, or drop us a note with your preferred build specs and we'll work up a quote and timing for you.

I'm honestly reticent to swap out the Al33s that I've been riding all year, but I am excited to try them out. Big ride on them tomorrow, so we'll have an initial ride impression then. And actually since it's about 65* and bright sunshine out, a short shakedown lunch ride is in order right now!

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Ryan – Last word we got was spring next year for Exalith. No idea how much weight you should give that info.


Are they going to produce the rim with exalith coating or was that just a marketing thing for relaunch?

Ryan M

Gummee – Right. I think that the world needed a new Open Pro that’s just a wider maybe tubeless version of the Open Pro. Tubeless is a market demand but I don’t think adoption is that high yet and maybe never will be. In any case, there’s definitely a slot for a cost effective wider basic ‘rim flavored rim’ in the market. Initially it seems Mavic has come close but we’ll see.

William – Have not installed a tubeless tire yet, will try some soon. Will also try the Mavic tires and see how they are to ride. They should be an easy fit and simple inflation

Håkan – You’ve got the right one. I was going from memory. And this means that a C24 is 7w down to a 303. It was actually the shallower and slight narrower (compared to new OP) Mavic Ksyrium Pro that was almost 13w down to the 404.

Again, 10 or 7w is more than nothing but not holy freaking cow what a difference. One shouldn’t read us as claiming the OP is definitely the same as C24, but they are similar enough that I sure wouldn’t expect much room between them.

Excellent questions/comments, thank you all.


You wrote:
“Shimano C24 which Tour Mag tested as down 13w to a Zipp 404”
In which issue of Tour Magazin is that test published?
I wonder because in Tour 8-2016 both Shimano DA C24 CL and Zipp 404 Firecrest are tested, and the difference is 10.2W ( 232.2-222) here is that test


Any comment on ease of tubeless install? One of Mavic’s big selling points in developing their standard is that it would be much easier, so much so that you could get them to seat even with a track pump in many cases.


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