Tuesday, August 16, 2016

Plus-Sized Tires: Just Because You Can

Surly Krampus, the ORIGINAL plus-sized bike
There are those who say that "Just because you CAN do something, doesn't mean that you SHOULD." To them I say, "But sometimes it DOES mean you should."

Case in point, "plus-sized" tires on your mountain bike.

First, a bit of background. What are "plus-sized" tires? The term "Plus" when it comes to bike tires is generally used to refer to tires that range in width from 2.8 inches to 3.25 inches. Sometimes called "mid-fat," they are wider than your typical mountain bike tires, but not as wide as your true "fat" bike or "snow bike" tires.

The idea with plus tires is that you get some of the benefits of uber-traction like with fat bikes, but less of the disadvantages, like all that extra weight, plus the "self-steering" feeling you can get with some fat bike tires.

Surly Bikes, being the under-appreciated vanguard of things new and cool in the bike world, first came up with the idea of plus-sized tires. Their Krampus came out in late 2012, featuring the first plus tire, the Surly Knard 29x3.0. I had the opportunity to first test-ride the Krampus at Interbike 2012, and was sold on the idea from the start.

We ordered a few of the Krampus for stock in our stores, and they hung around for quite a while before we finally sold out. I think that Northeast Ohio wasn't yet ready for the "plus" concept yet. Or, maybe people were intrigued, but figured, "If this is version 1.0 of this idea, maybe I should wait and see what version 2.0 looks like?" What do you think?

Surly followed up on the Krampus in 2013 with the ECR, what they referred to as "the love child of a Krampus and a Long Haul Trucker." Designed for off-road touring, the ECR combined the 29+ wheels of the Kramps with upright touring geometry.
Surly ECR 29+ touring bike
I test-rode the ECR at SaddleDrive 2013, and again, was hooked.

I bought my '14 Salsa Mukluk 2 fat bike at the beginning of 2014, and enjoyed it through that snowy season. Come springtime, I was looking for a way to liven it up for the summer, so I bought a pair of the Surly Knard 29x3.0 tires and Surly Rabbit Hole 29er rims (the same ones that come on the Krampus and ECR), plus a pair of Salsa hubs, and had our ace Service Manager Rich lace them up with DT Swiss double-butted spokes.
Salsa Mukluk 2 with 29+ wheels
I took the first test-ride with this setup on the Cleveland Metroparks Ohio & Erie Canal Reservation Mountain Bike Trail. The ride was as fun as I had hoped. The rigid fork does beat me up a bit, but I was used to riding a rigid off-road bike already. I continued to  ride this as my primary mountain bike throughout the rest of the season, including at the Royalview Trail, Bedford Singletrack, Mohican State Park, and topping off the season with the Iceman Cometh Challenge race in Michigan. My full-suspension mountain bike sat in the basement collecting dust.

2015 rolled around, and I, being one who likes to tinker, experiment, and be on the bleeding edge, was looking for a way to build a new biking experience without building a new bike. I had a 2013 Raleigh Talus 29er that I had acquired from my friend Sean at Main Street Cupcakes. I had been doing some reading that many 29er mountain bikes could fit 27.5+ wheels. The outer diameter of a 27.5+ wheel is almost the same as a regular 29er wheel, and most 29er frames have enough clearance to fit the width of a 27.5x2.8 tire.

So, I bought a pair of Velocity Dually 27.5 rims and WTB Trail Blazer 27.5x2.8 tires. We had a nice pair of old Real Mountain Hubs in the store, so once again, I had Rich lace them all up.
Raleigh Talus 29er with 27.5+ wheels
The Raleigh, with a suspension fork and the 27.5+ wheels, was everything you want in a hardtail mountain bike and more. The fork took the edge off the bumps and roots, while the plus tires grabbed the dirt, allowing me to rail corners and maintain speed.

Most forks, both rigid and suspension, have plenty of tire clearance to spare, and that was the case with this one and the 27.5+ tires. In the back on the Raleigh Talus 29er frame, it was a little tight between the chainstays and seatstays. Manufacturers recommend at least 6mm of clearance on either side of the tire for safety, since frames flex when ridden. I had less than that, and I did get a little tire rub when pushing the bike hard.

Looking for other ways to push the envelope, I tried these same wheels on my Salsa Fargo:
Salsa Fargo with 27.5+ wheels at Bedford Singletrack
The plus wheels on the Fargo make this bike a little more playful compared to its standard 29er wheels. It's perfect for smooth, flowy singletrack like you'd find at the Bedford Reservation, and perfect for the warm and dry conditions we had late into the season last fall. I took it to the East Rim Trail on opening day last October, just because it was the bike I happened to have with me that day. The tires worked well on that trail, although the weight-forward position of the drop-bar Fargo was a bit tough to handle on that trail. This setup would be perfect for an extended back-road/off-road multi-day tour.

Tire clearance in the Fargo frame was better compared to the Raleigh. While still less than the recommended 6mm, I've never had any problems with tire rub.

For the 2016 model year, Salsa Cycles, following in the footsteps of their sister brand Surly, released the first full-suspension 27.5+ bike, the Pony Rustler, which I had the opportunity to test-ride at SaddleDrive 2015.
2016 Salsa Pony Rustler Carbon X01
In the meantime, last year I had to downsize my bike collection due to moving, so the Raleigh Talus 29er had to go (I kept the 27.5+ wheels and sold it with a pair of regular 29er wheels).

My latest bike acquisition in January was a Surly Ogre. This was one of those bikes that I didn't really have a need for, but I've always loved the "Tannish Gray" color, and at that time, I noticed that Surly was down to one left in stock in my size, so I grabbed it and built it up with some parts I had around, and put my 27.5+ wheels on it.
Surly Ogre with 27.5+ wheels
The Ogre is designed to handle up to 29x2.5-inch tires. Clearance with the 27.5x2.8 tires was better than on the Fargo, and I have not had any tire rub issues. Both the Ogre and the Mukluk with have been my go-to mountain bikes this season; I've probably ridden them both about 50/50 when I hit the trails. Think of this Ogre like a "poor man's ECR" -- 27.5+ instead of 29+ wheels, although the Ogre shares frame geometry with the Karate Monkey, so it's a little more singletrack-friendly compared to the ECR. At over 33 pounds, it's a bit of a pig going uphill, but my SRAM 2x10 drivetrain with 11-36 cassette gives me plenty of gearing to crank it up, however slowly that may be. This bike would be perfect for a multi-day off-road tour.

Here we are in 2016, and you will see in the coming season that just about every major bike company has some version of plus bike, either 27.5+ or 29+, or both. (Surly, in their infinite surliness, have updated their Troll frame to accommodate 26x3.0 tires, to prove that 26-inch is not yet dead.)

Having ridden various incarnations of plus-tired mountain bike during the past two years, I've decided that this is the perfect platform for my style of riding and for the typical Ohio mountain bike trails. What I really need is another bike with front suspension that handles 27.5+ tires out of the box. I've been mulling over two options:

  1. Get a RockShox Bluto fat bike suspension fork for my Salsa Mukluk, and rebuild my wheels using the Velocity Dually 27.5 rims, WTB Trail Blazer Tires, and Salsa fat bike hubs.
  2. Decide which of my current bikes I can live without, and buy a new dedicated 27.5+ hardtail, such as the Salsa Timberjack GX1 27.5+, which we will soon have IN STOCK!
Which will it be? Stay tuned to find out...
Salsa Timberjack 27.5+ GX1

1 comment:

  1. Thanks for experimenting. In 2015 my 2012 Fargo was stolen. When I bought a 2016 Fargo Frameset, I was excited about the wider clearance for the opportunity to try 29x3 tires. When my plus fargo hit the trail, my 2011 5in travel 29er collected dust...it's liberating to own one low maintenance, quality do-it all bicycle = more riding time. My custom ride has covered 5000mi+, and has gone through some changes: It started life as an internally geared 11 speed alfine drive. Now it's an endangered species boost 2x10 24/38 by 11-36....and I'm so glad Origin8 makes a 2x boost crankset with hollowtech II BB and appropriate chain rings to pull it all together. I'm gradually upgrading my 25i hoops to Carbon LB EN933 33i rims. I'm also building an extra front to hold a 29x2.8 studded tire for handling those drawn out melt-freeze cycle patches of winter. People are saying 40i to 50i rim width is best for plus tires, but I made 25i plus work for 5000mi. Plus tires inherently offer such improved grip over 2.35's that and I'm not eager to lug around 50i wheels to deal with bead leaks and rim strikes while occasionally smearing along a trail at 10 psi. Also consider how spreading a tire creates a flatter tread profile, which can be less predictable while leaning and less nimble while managing ruts, etc. I'm enamored with Light Bicycle's AM/EN 933 model with asymmetrical offset spoke drilling and e-bike rating for a stronger wheel, rated for higher commuting speeds/loads in the future.

    I build my own bikes because I ride about 2000-3000mi each year mostly commuting to work, and I'm too frugal/stubborn to spend bicycle industry monopoly money to not get a durable product I enjoy using for all conditions I experience. I considered starting over with a new Fargo, but found the 2x Fargos had limited usable gear ranges and no room for plus tires. I am nostalgic about the range of my triple chain ring 2012 Fargo with trail granny to 33mph pedaling range - which I actually used daily while commuting up and down the fault line hill to and fro University of Utah. I now have what may be the only 2x10 boost bicycle I'll ever see (thanks to Origin8's smart boosted wide range chain ring design of the thruster crankset & spider with Hollowtech external cup BB) 24/38 x 11-36 maxes out Shimano's long hanger 'chain wrap'. By design, the bike has handled pavement commutes and singletrack seamlessly with grace. Shimano's recent clutch rear and side pull front derailleurs are huge improvements...dropping a chain is rare, and plus tires fit around the front derailler. By the way, recent microshit bar end shifters have precise indexing, unlike those that came with my 2012 Fargo.