The 3T ARX Team stem is built to balance competing factors: It needs to be light, it needs to be stiff, and it needs to be immensely durable. Perhaps it's no surprise, then, that Arx is Latin for stronghold. Durability is its greatest quality.
The ARX Team is forged to give its aluminum grain structure optimal strength. The steerer and bar clamp are beefed up but carefully designed to minimize stress on your fork steerer tube and handlebar (whether they're carbon or not). The ARX Team passes the recently re-vamped, made-much-more-demanding DIN and CEN certification tests.
At 120g, 3T keeps it light by outfitting the ARX Team with a titanium bolt package. It's available in 10mm increments between 90mm-130mm. It comes in a +/- 6-degree (aka 84-degree) and in a +/- 17-degree (aka 73-degree). The stack at the steerer clamp is 40mm tall. It comes in a 31.8mm clamp size only.
Upgraded to the 3T Arx team alloy stem and was immediately impressed with the improved stiffness it provided on my road bike with my 195 lb weight. Matched the 3T stem with the 3T bars and seatpost. Overall I am extremely satisfied with 3T products and highly recommend them. I have the stem on my mountain bike as well and cannot find any faults.
One of the bolt snapped way before reaching the torque value of 5N.m. I stopped there and returned the stem. A friend of mince had 3 bolts snap.
I have the ARX pro on all my bikes and love them but the Ti bolts from 3T are of the lowest quality. Maybe we got a bad batch.