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Astute readers of the blog will be aware that we've been testing a new rim for a couple of months now, and will likely have been frustrated with our caginess regarding same. Last night, I got a text from Interbike, where said rim is being shown, that said "dude, people are going GAGA over these!" To which I replied "well, duh - welcome to the first time I've said I told you so." Product announcements are always hard to time, but at the risk of making everyone want these before they're available (we'll be able to start shipping them in November - what a great month!), here you go. We've got roughly 1500 miles on a set of AForce AI33 rims, and they're great. I'm actually the first person in the US to have built or ridden a set, and it's been fun to sit back and read what people have speculated about them online while I've been secretly riding around on them. 

Specs are pretty simple: 32.5mm deep, 19.6 inside brake track, 24.2 outside brake track, 26.2 max width, with a nice 9mm tall brake track. Per rim weight is 470.5 (it's claimed at 465, ours are 470 and 471). The extrusion thickness at the nipple bed is 2.1mm, which is thick for a performance-oriented and weight-conscious rim. The shape, as you can see from the pics, is toroidal. They are made of a 6000-series aluminum alloy variant that is claimed as harder and stiffer than normal rims. I can vouch for the stiffness, and they sound different from other alloy rims when you're handling them. Durability has been on fleek to date (see what I did there?).

Nice shape

The set we have has internal nipples and 2:1 lacing on the rear, as well as the optional ceramic brake track. Our inclination is to stock and do standard builds with external nipples, 1:1 rear lacing, and do the ceramic brake track. With so limited a universal of test rims, we're testing what we were given to test. Given that they are absolutely arrow straight after what I've put them through, I'd be fine going with internal nipples but people generally hate them. 2:1 lacing solves for a situation (inadequate non-drive tension) that hasn't been an issue in thousands of our builds, and it leaves a LOT of space between non-drive side points of control (like 8"). The ceramic brake track is a huge part of the story, though, and I can't see us selling a single set without it. 

1500 miles worth of brake track wearMost people just looking at the wheels assume they're carbon. The ceramic brake track has developed a sheen much like what you'd see on a carbon brake track. The wear is even. The rims still look great. I'm far from a maintenance freak, and since the supplied pads got lost in transit I've been using a set of the carbon pads we used to supply with older generation Rails. At first I used pads for alloy rims and they freaked me out with how much pad slough (new term, there) there was. BikeRadar experienced a similar thing with the supplied pads in their review of them. The Rail pads have had none of that, they're dead silent, and they brake at par with Easton and HED rims (which is to say as well as any rim I've ever used). I don't know what effect they have on rate of rim wear, but since the rate of rim wear using them is so darn minimal I think I'm glad that we have a large box of leftover pads to use with them. They're a great match.

Mmm, carbon-y looking

As to the aerodynamics, we can't yet say precisely (as you know, saying without knowing isn't our game). We're coordinating a significant wind tunnel trip (A2 will do the testing) that will give a definitive look at how these compare to standard-bearer carbon wheels (404s), shallower carbon wheels, and other alloy rims on the market. Expect that to happen within about the month. From riding, I can tell you that they aren't slow, and that they are as manageable in crosswinds as any wheel I've used. Tire installation is easy, and the tubeless interface works great for road. Haven't tried a CX tire on them yet. 

Our enthusiasm for these is a continuation of the philosophy we've been developing for almost two years now, that resulted in our decision to end the Rail 34, and which came to a peak with this post I wrote in May of this year. A tubeless-compatible carbon clincher of this width, depth, and assumed aerodynamic profile would weigh not less than 20g per rim less than these, at somewhere starting at somewhat more expensive than these (for "who knows where it came from" eBay/Alibaba carbon) to 4+ times as expensive for super premium options. And you have the manifold benefits of an aluminum rim - better braking, no overheating worries, and way cheaper to replace after a crash. The final analysis will hinge to a degree on what A2 tells us, but so far these are among the nicest road wheels I've ever used. It's something of a golden age for alloy fans as the Easton R90SL slots right into that group, too. And I've ridden darn near everything. 

So there you go, some breaking news for you.  


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  • Hans on

    Thanks, Dave. I look forward to seeing this new rim in the market for those building wheels. I don't have any use for a rim-brake rim, but I trust that the disc-specific version will follow quickly. Agreed that 100g per rim is huge. It's sad that the Flo30 is so heavy. But maybe also sad for them (Flo) that their articulate aero vs. weight research has failed to convince the market that the 100g doesn't really matter when it comes to those "seconds saved". But I commute on Flo30s and I can definitely tell they're heavy rims compared to my Grail wheelset. To be fair, they also appear to made of pretty stern stuff, and my Grail rims seemed to dent pretty easily.I look forward to seeing the aero results too. Honestly, other things being equal, I guess I'd also pay a few extra $$ for quantified speed.

  • Martijn on

    I own a set of these. After only 900km, the ceramic brake track is more or less gone. The wear is not even. Used the supplied brake pads and cleaned my rims after every ride in wet or winter conditions (which is in total about 250 km) I don't find that long lasting. Aforce says is this is normal wear, no guarantee. What are your thoughts on this?

  • Dave on

    Hi Bill -I just don't know if it's Keronite. It's been billed exclusively as ceramic. It feels basically the same as any other brake track to the touch, it demolishes regular brake pads but carbon pads seem to get along with it just fine, and it's WAY more durable than any anodized brake track I've yet seen. If Ryde is using Keronite, then this is not that – one rainy ride hammered the black brake track on a set of Rydes we tested. Dave

  • Bill on

    Do you know if the ceramic coating on the brake track is Keronite? (http://www.keronite.com/, aka plasma electrolytic oxidation) Just curious as I know of one other wheel manufacturer using this on their rims recently. The Al33s sound like great rims and tick off many boxes for me: aero/semi-aero, wide inner bead width, light, reliable braking, carbon-y looking brake track. And I agree with you guys that strange lacing patterns and internal nipples are bad.



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