Just In: Ultra Wide Ibis 741 Carbon 27.5 Wheels

They look cartoonish.

In my experience the conti 2.4’s were oversize, while the 2.2’s were under. (The 2.4 measured almost to spec initially, then grew bigger after a week or so mounted). I’d like to see it on another rim for comparison, perhaps a Stan’s flow.

Hate to say but as someone who has allot of time on i30 rims I can tell you that the exact opposite it true. For 650b tires 2.3 is the largest Minion you can get which still causes the sidewall to stick out further than the tread. The 2.4 Highroller 2 has a wide enough tread that the side knobs are still wider than the casing. If you turn hard the 2.3 Minion is pretty much unrideable. The 2.4 HR2 is hands down the better option of aggressive riders. It baffles my mind to hear people recommend a 2.3 minion for wide rims…it does not work

“The second number is the outside diameter of each rim, either 41 or 28mm”. I think it should be width instead of diameter.

Lusty bits.

P

Real progress: $1300-1500 for a set of wheels that weights more than an All Mountain aluminum costing 1/2-1/3.

Derby knock-offs. Didn’t Derby come up with this design first?

But still no asymmetric spoke holes?

So some don’t deal with change well… It’s not about looks kids, it’s about performance. If the looks make you worry then you’re just superficial and petty. Perhaps spending money on therapy instead of wheels is the best idea?

Zelvy carbon 40mm.. Best carbon wide rim on the market. Low pressure tubeless zero tyre roll, more grip than you can ask for with more tyre contract to the ground and I’ve never had a problem running 20psi or less. If your going to spend money on carbon rims you might as well buy the best product..

“The width also causes the tread surface to flatten out a bit, so it’s probably best to run the highest volume tires with the best tread wrap you can fit. Ibis’ own Scot Nicol recommends anything with a rounded profile…”

I’m really tired of hearing this. It’s one thing for ignorant forum posters to say this and even uninformed blog “editors” to copy it, but it’s another for a manufacturers to repeat the same stupid myth. This is one example of many that proves the bike industry has a dire shortage of critical thinking skills.

The radius of curvature of a tire mounted on the Ibis rim is only about 5% greater than on a conventional “wide” rim like a Flow or i25. It’s not very much. Furthermore, it is only curved when not in contact with the ground as once under load the tire flattens. The curvature is something you see when it doesn’t matter, it’s not something that exists when the tire is working. Differences in performance come from the rim’s support of the sidewall, not anything visible on the top of the wheel.

You’re not seeing the curvature anyway, you’re seeing the sidewalls sticking more beyond the width of the outer knobs which gives the illusion of the tire being “squared off” which is where this nonsense originated.

While we are at it, stop talking about “highest volume”. The amount of air captured by the tire is irrelevant. A larger casing makes for a taller tire that could, perhaps, support lower pressures. A wider rim does not increase the height of a tire so air volume is NOT the relevant measure, casing size is (and rims don’t change that). Another example of the industry being driven by the ignorant.

We need bigger tires and proportional rims, not more “air volume” for more “cush”, I throw up a little every time I read that.

Tom – look at Derby rims. They have a 35mm wide 29″ rim. Plenty wide but not so much that it messes up 2.2 or 2.3 tires.

@burritobeau
“If you put the same tire on a wider rim it DOES in fact increase the volume”

Read it again please !
The shape is certainly modified, but how can you assume the volume is ????????

@ED Volume of a tire is related to 2 things. One being diamater of the rim (29″ x 2.25″ tire has more air volume than a 26″ x 2.25″ tire, assuming similar design). The second is the circumference of the rim + tire cross section. So a 25mm rim + 2.25 inch tire is going to have 25mm + sidewalls + tread. Taking that same tire and putting in on a 41mm rim you get 41mm + sidewalls + tread. So the higher circumference will hold more volume.

So with a larger volume you can run a lower pressure without having rim impacts. Ibis also makes a decent case for being more burp resistant since for a given lean angle you are more likely to still be under the rim. Explaned better with the video at https://www.youtube.com/watch?v=2x6saXUdA9o