They were 144's. I didn't particularly care for the 600HO RMK. Power was fair, although a little lacking for any serious climbing in deep snow. Top speed about 80, track was OK. But I got to hating the thing toward the end of the week for trail riding - it simply wouldn't track and I just fought the thing for cornering on the trails - I haven't ridden a sled that pushed the corners that bad in 15 years. I know, it's a mountain sled, but the M7 I originally rented (until it broke) handled very well, especially by comparison - and it had a 153 inch track. I suppose I could have done something to dial in more ski pressure, but I didn't. Overall, that RMK was a truly uninspiring sled, and worse than uninspiring for any trail riding. Hope your experience is better.