Industry Nine (i9) earned its reputation by creating bulletproof, beautiful billet aluminum components in Asheville, N.C. Its mountain bike hubs earned an envious position as a top choice for riders building high-end custom wheelsets. The Solix SL AR40c partners the familiar i9 hub design ethos with its own new, modern carbon all-road rims.
I tested the Industry Nine Solix SL AR40c wheels for 10 months on a gravel bike that I used when there was a substantial amount of pavement on the planned route. In my area, rough, blown-out chip seal roads barely big enough for two lanes connect sections of hard-packed caliche byways. The average speed of these rides was on the fast side of my multisurface jaunts.

In short: The Industry Nine Solix SL AR40c all-road wheelset proved to be a high-performance choice for cyclists who want to go fast on both tarmac and dirt roads. It heavily skewed toward the fast and efficient side of the scale versus the adventurous and comfortable end. The Solix wheels are an ideal choice for gravel racing, and the hubs backed up the i9’s reputation for creating bulletproof but attractive products.
Looking for a new gravel rig? Check out our guide on the best current gravel bikes.
- Rim material: Carbon
- Rim internal width: 25 mm
- Rim depth: 40 mm
- Tire compatibility: 30-55 mm
- Rim diameters available: 700c
- Spoke material: Steel
- Spoke count: 24 front and rear
- Set weight: 1,430g (660 front, 770 rear)
Pros
- Fast and efficient feel
- Industry Nine's reputation for durable, serviceable hubs
- Light for the rim depth
- 12 available anodized colors for hubs and spoke nipples
Cons
- Straight-pull, direct thread spokes might be hard to find
- Not as comfortable as more adventure-oriented gravel wheels
Industry Nine Solix SL AR40c Review
Those i9 Solix SL Hubs

AR40 Carbon Rims
Riding the Industry Nine Solix SL 40c Wheelset

Solix SL Hub Performance
Handling
Durability
Conclusions: i9 Solix SL AR40c Gravel/All-Road Wheelset
