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I've spent a fair amount of time this winter trying to get the ultimate snow machine out of my RIP9. I've got the widest tires and rims (I've got 38mm rims, but a 50mm rim just came out) that I could find on it. It's a marginal ride on most days around here. I wanted to get a Pugsley with Endomorphs. My wife decided she wanted to go on a biking tour in Italy this summer so my purchasing privileges have been curtailed. I could no longer afford the $2k build on the Pugs. I could, however, embezzle $350 for the Ktrak and hide that from the wife. I originally wanted to put the Ktrak on the RIP9, but I didn't have a spare disk for the rear brake. My 575 had a spare...and was longing to be used. Since the snow began, I haven't touched it. I looked at the Yeti and it seemed to say "Strap some wacky track to me and let's do some riding...I don't care if I look silly". So, here's my ongoing review of my RIP and Ktrak-575 as I put them through the paces.
My 29er is a Niner RIP9 with 38mm Kris Holm rims and 2.55" WTB weirwolves. My 26er is a Yeti 575 with Ktrak on rear and Maxxis Minion 2.35s on the front.
I didn't use the ski because I wanted to use a front brake. Plus, I need to haul the sucker around. The Ktrak with a front tire will fit my Thule rack provided I pull the rear plastic stop off the rail.
First off, the Ktrak is a wee smidge on the tubby side. How tubby? 28 lbs.
But what's 28lbs for your average bike rider? Unless you're a weight weinie, you shouldn't notice strapping 28lbs onto a 25 lb bike. Ktrak says that the extra weight is roughly equivalent to a 6-pack of beer. Maybe they meant a 6-pack of Warsteiner mini-kegs? My Echo chainsaw that I sometimes strap to my bike comes in at 12 pounds. If I put on a wider chain on the saw and duct taped it to my frame, it would give me the motorized equivalent of a Ktrak at...eh...roughly half the weight.
So, if you can ignore the enormous pink elephant that is the Ktrak weight, read on. As it turns out, I used to take my 30 lb daughter trailriding in a kid seat on the back of my bike. We had a crash (it wasn't my fault!) and now she refuses to ride with me anymore. But...I do have experience hauling 30 pounds of deadweight. At least the Ktrak doesn't scream "Daddy I'm scared of crashing" at me.
I hauled both the RIP9 and 575 up to the ski hill (Pajarito) to do the cross country trails. I pulled the RIP9 off first...it doesn't give me a hernia pulling it off the car. I rode down to the cross country trail and sank 4-5 inches into the 'packed' snow. Doh! So...the RIP9 didn't work today...unless I wanted to make 4" deep ruts in the track. I went back and grabbed the Yeti and managed to blow right past the section the RIP sank in. Yep, the float on the Ktrak does work...sorta. More on that later. But...for today I couldn't ride the RIP, but could ride the Yeti/Ktrak...so I guess that's a nod to the Ktrak....sorta. One didn't work, and one sucked @$$...but I'm getting ahead of myself.
I took off on the Ktrak and could only go 10-20 feet before someone would stop me and ask me what I was riding. A guy in his 70's stopped me for 10 minutes, asked me what that 'contraption' was and then proceeded to tell me about delivering papers in Chicago on ice 'before the war'. The thing does get attention...too bad the trail isn't littered with bikini-clad playboy models. If chatting with middle-aged folk with dogs is your bag, then the Ktrak will provide that in spades.
I proceeded to ride uphill up to the open meadow called Canada Bonita. Even with a full suspension bike, I can feel the treads transmitted up through the bike to my butt. It's like sitting on one of those coin-operated beds they used to have in cheap motels. The bike also sounds like a friggin' tank. The treads make the same kind of clatter on the snow that you hear if you watch old war documentaries showing the real thing. I guess if you wanna scare the crap out of a cross country skiier (Whoa...WTF....I hear a tank coming at me) then it might be worthwhile.
The Ktrak will go uphill. Oddly, it's specced with a 29t rear cassette being the largest of the bunch. So you have to be in great shape to power 200 pounds of lard, the added rolling resistance of the Ktrak, and the snow resistance, up a steep hill. I'd love to say I'm in stellar shape...but 4 months of drinking beer, egg nog and occasionally riding haven't put me in tour-de-france conditioning. The uphill riding was an unpleasant grind. Traction was good on the Ktrak, but if it was steep enough and I stomped hard enough, I could spin the rear wheel. This would dig a trench which I couldn't ride out of...so I'd have to push it. Starting uphill generally resulted in me spinning and digging into the snow. I think that's the reason for the 29t rear cassette. A typical 34t cassette may result in plowing a furrow for seeds instead of any significant forward motion.
I finally made it to the meadow...a climb of maybe 500' over 2 miles. I rode most of the way, but did push some when I could feel my heart beat in my head. Temps were lower up there and so the packed snow had never crusted over. Trying to ride on that resulted in the rear sinking even in the packed trail. As you can see, the front tire is floating, but the rear is dropping into the snow.
I hoped to ride downhill cross country across fresh powder. Both me and the bike sank 40" in snow. Ok...that wasn't gonna work. So I hauled it back to the packed track and started downhill.
At some point along that downhill run, the front tire cut through the upper pack. The forward motion of the bike punched the tire all the way down to the solid ground (similar to photo).
The bike came to a sudden halt. My feet, however, skiied across the packed trail until my shins (painfully) whacked into the handlebars. My upper body kept going, my feet hooked the handlebars and ripped the bike out of the snow. I landed head first, luckily breaking my fall with my nose. The bike slingshot out of the snow and landed on top of me. Together, we tumbled, legs intertwined with wheels, arms jumbled with bike frames, for another 30-40 yards. Great...the snow wasn't firm enough to support my 200lb body on the bike, but it was firm enough to support me wrapped up in a bike as we slid for an eternity. I got up...snow packed in my earhole and looked around for giggling gawkers. There wasn't a soul around for miles, but I still felt people laughing at me. I spent the next 15 minutes filling in the 3' deep, 4' diameter hole that my front tire made when ripped out of the packed trail. If I had the front ski on, I don't think I'd go OTB, but the rear would still have sunk. So...float over the 29er is better...but it's not perfect. Be careful on these things if the snow is deeper than 6"...even if it is packed.
Overall, it was fun on the downhill and flat parts. Uphill was unpleasant (as most uphill tends to be) but did work. Traction was better than a tire, but flotation was crappier than I hoped.
I'm going to go hit some single track in the next few days to compare the 29er with the Ktrak 575...if I can find some trails with only 6" or so of snow. I'm curious how the Ktrak handles the non-uniformity of a typical trail. Rocks, logs, etc. are going to be there that isn't on a cross country track.
Fight!
My 29er is a Niner RIP9 with 38mm Kris Holm rims and 2.55" WTB weirwolves. My 26er is a Yeti 575 with Ktrak on rear and Maxxis Minion 2.35s on the front.

I didn't use the ski because I wanted to use a front brake. Plus, I need to haul the sucker around. The Ktrak with a front tire will fit my Thule rack provided I pull the rear plastic stop off the rail.

First off, the Ktrak is a wee smidge on the tubby side. How tubby? 28 lbs.

But what's 28lbs for your average bike rider? Unless you're a weight weinie, you shouldn't notice strapping 28lbs onto a 25 lb bike. Ktrak says that the extra weight is roughly equivalent to a 6-pack of beer. Maybe they meant a 6-pack of Warsteiner mini-kegs? My Echo chainsaw that I sometimes strap to my bike comes in at 12 pounds. If I put on a wider chain on the saw and duct taped it to my frame, it would give me the motorized equivalent of a Ktrak at...eh...roughly half the weight.
So, if you can ignore the enormous pink elephant that is the Ktrak weight, read on. As it turns out, I used to take my 30 lb daughter trailriding in a kid seat on the back of my bike. We had a crash (it wasn't my fault!) and now she refuses to ride with me anymore. But...I do have experience hauling 30 pounds of deadweight. At least the Ktrak doesn't scream "Daddy I'm scared of crashing" at me.
I hauled both the RIP9 and 575 up to the ski hill (Pajarito) to do the cross country trails. I pulled the RIP9 off first...it doesn't give me a hernia pulling it off the car. I rode down to the cross country trail and sank 4-5 inches into the 'packed' snow. Doh! So...the RIP9 didn't work today...unless I wanted to make 4" deep ruts in the track. I went back and grabbed the Yeti and managed to blow right past the section the RIP sank in. Yep, the float on the Ktrak does work...sorta. More on that later. But...for today I couldn't ride the RIP, but could ride the Yeti/Ktrak...so I guess that's a nod to the Ktrak....sorta. One didn't work, and one sucked @$$...but I'm getting ahead of myself.
I took off on the Ktrak and could only go 10-20 feet before someone would stop me and ask me what I was riding. A guy in his 70's stopped me for 10 minutes, asked me what that 'contraption' was and then proceeded to tell me about delivering papers in Chicago on ice 'before the war'. The thing does get attention...too bad the trail isn't littered with bikini-clad playboy models. If chatting with middle-aged folk with dogs is your bag, then the Ktrak will provide that in spades.
I proceeded to ride uphill up to the open meadow called Canada Bonita. Even with a full suspension bike, I can feel the treads transmitted up through the bike to my butt. It's like sitting on one of those coin-operated beds they used to have in cheap motels. The bike also sounds like a friggin' tank. The treads make the same kind of clatter on the snow that you hear if you watch old war documentaries showing the real thing. I guess if you wanna scare the crap out of a cross country skiier (Whoa...WTF....I hear a tank coming at me) then it might be worthwhile.
The Ktrak will go uphill. Oddly, it's specced with a 29t rear cassette being the largest of the bunch. So you have to be in great shape to power 200 pounds of lard, the added rolling resistance of the Ktrak, and the snow resistance, up a steep hill. I'd love to say I'm in stellar shape...but 4 months of drinking beer, egg nog and occasionally riding haven't put me in tour-de-france conditioning. The uphill riding was an unpleasant grind. Traction was good on the Ktrak, but if it was steep enough and I stomped hard enough, I could spin the rear wheel. This would dig a trench which I couldn't ride out of...so I'd have to push it. Starting uphill generally resulted in me spinning and digging into the snow. I think that's the reason for the 29t rear cassette. A typical 34t cassette may result in plowing a furrow for seeds instead of any significant forward motion.
I finally made it to the meadow...a climb of maybe 500' over 2 miles. I rode most of the way, but did push some when I could feel my heart beat in my head. Temps were lower up there and so the packed snow had never crusted over. Trying to ride on that resulted in the rear sinking even in the packed trail. As you can see, the front tire is floating, but the rear is dropping into the snow.

I hoped to ride downhill cross country across fresh powder. Both me and the bike sank 40" in snow. Ok...that wasn't gonna work. So I hauled it back to the packed track and started downhill.
At some point along that downhill run, the front tire cut through the upper pack. The forward motion of the bike punched the tire all the way down to the solid ground (similar to photo).

The bike came to a sudden halt. My feet, however, skiied across the packed trail until my shins (painfully) whacked into the handlebars. My upper body kept going, my feet hooked the handlebars and ripped the bike out of the snow. I landed head first, luckily breaking my fall with my nose. The bike slingshot out of the snow and landed on top of me. Together, we tumbled, legs intertwined with wheels, arms jumbled with bike frames, for another 30-40 yards. Great...the snow wasn't firm enough to support my 200lb body on the bike, but it was firm enough to support me wrapped up in a bike as we slid for an eternity. I got up...snow packed in my earhole and looked around for giggling gawkers. There wasn't a soul around for miles, but I still felt people laughing at me. I spent the next 15 minutes filling in the 3' deep, 4' diameter hole that my front tire made when ripped out of the packed trail. If I had the front ski on, I don't think I'd go OTB, but the rear would still have sunk. So...float over the 29er is better...but it's not perfect. Be careful on these things if the snow is deeper than 6"...even if it is packed.
Overall, it was fun on the downhill and flat parts. Uphill was unpleasant (as most uphill tends to be) but did work. Traction was better than a tire, but flotation was crappier than I hoped.
I'm going to go hit some single track in the next few days to compare the 29er with the Ktrak 575...if I can find some trails with only 6" or so of snow. I'm curious how the Ktrak handles the non-uniformity of a typical trail. Rocks, logs, etc. are going to be there that isn't on a cross country track.
Fight!