Fulfilling your cross-country racing needs, the Industry Nine Ultralite 235 29in Boost Wheelset delivers lightweight efficiency, stiffness, and enhanced traction that leaves the competition eating dust. Tipping the scales at a feathery 1455 grams, the Ultralite 235 drops serious weight off your XC whip for instant acceleration when you're cranking up long climbs and bursting out of corners. However, that's not to say it's lacking in strength when you're plunging into rocky downhills or technical stretches. Robust aluminum construction, tapered spokes, and a revised design places extra material where it's needed most to ensure the durability needed to ride hard.
Overhauled for a wider footprint, the wheelset's 23.5mm internal width accommodates a 2.3-inch tire for greater traction and better bump compliance on rough trails and technical courses. Boost axle standards significantly increase wheel stiffness, which is something that's plagued 29ers since inception. By converting to Boost standards on your 29er, your front wheel's stiffness becomes comparable to a 26-inch wheel, with the rear becoming just as stiff as a 27.5-inch wheel. Ultimately, this equates to precise tracking and extra confidence for holding tricky downhill lines.
The Ultralite 235 Wheelset uses I9's highly acclaimed Torch hubs, which feature near-instantaneous three-degree engagement for powering up and over trail obstacles with ease. Teflon shields and O-rings snap solidly onto the end caps of the hubs, preventing trail grit from slowly compromising the wheel's smooth characteristics. The Ultralite 235 comes tubeless-ready with factory-installed rim tape and Presta valves. Choose the HG driver if you're riding a Shimano/SRAM 9/10-speed drivetrain or pick up the XD driver version if you're running the latest 11/12-speed drivetrain from SRAM.
- Lightweight wheelset for cross-country and marathon racing
- Aluminum construction shaves weight without sacrificing strength
- Internal width provides a wide footprint with more traction
- Stealthy good looks and vibrant details
- Industry Nine handcrafts wheels in the USA
View more 29" Mountain Bike Wheels - Tubeless
Reviews & Community
My Preferred Model
- Familiarity: I've put it through the wringer
The folks at Industry Nine have surely had to work more than just a few late nights to produce a wheelset lineup as fleshed out as they currently have. With Ultralite, Trail, Enduro, Backcountry 360/450, and fat bike wheelsets (as well as their S line, with straight pull stainless spokes) AND carbon rim options for many of their main line (non S/non fat) wheels, they're starting to blur together, and it's easy to miss the subtle differences.
These Ultralite 235's have a 23.5 internal (vs the trail 245's 24.5 internal, or the enduro 305's 30.5mm....), have a slightly lighter build to the rim, and only come in 24 spoke; so come in about 100 grams lighter than the 245. It is a fairly nominal amount, but enough for me to notice (I have ridden the boost version of this wheelset and the trail 245 quite a bit).
As a lighter rider (135lbs), I find most carbon rims far too stiff. The ride feels board like, and is extremely jarring on rides over 2 hours. Finding a set of carbon wheels that aren't specifically layed-up to rattle your brain out of your skull is possible but laborious (and much easier if you are 150lbs and above), and on my first ride on these wheels I knew I had found what I was searching for.
The ride is smooth, cuts buzz, but really does feel exactly the way a carbon wheel does leaning it into a corner. There is no discernible flex on my end; but really, there never was. I ride with high 20's PSI and burp my tires quite frequently; I'm not easy on my stuff, and these went a full season without needing the slightest true.
The engagement is exactly as it is advertised: ride changing, and even those crotchety folks who thought it never necessary (myself) are finding themselves installing star driver kits in their hubs to up engagement. MTB is a start/stop endeavor, lots of changes in gradient and terrain, and engagement controls how quickly you can get going again. It's helpful.
I was one of the first folks to get to ride I9's wheelsets back in 2007. A co-worker of mine at a local shop went to race La Ruta de los Conquistadores, and left with these wheels. He came back and told us stories of people at the side of the road with busted wheels asking for spokes; his race was largely incident free, with a couple spokes busting out from a lodged branch, which he repaired trailside and rode without servicing for the rest of the race.
If you're a lighter rider who knows how to handle your bike and wants to go fast, look no further.