One bike for all seasons, Part 2

Schwalbe Big Apple 26×2.35″ on a Surly Marge Lite, a 65mm singlewall rim with cutouts at a featherweight 690g.

188

You might have noticed I’m riding a snow bike with smooth tires and drop bars.  The purple Surly Pugsley that got me through a snowy Anchorage winter is now a road bike with really big tires, or a mountain bike with a drop bar and smooth rubber, or a really burly touring bike without, “what are those things called?”.

“Saddlebags?  Oh yes, panniers.”

Is it a mountain bike?  Yup.  A road bike?  Yes.  A touring bike?  Definitely.

These are the questions that will follow me around this summer.

I’m aware that’s it’s a lot to ask of one bike, but I’m asking.  The response so far has been positive.

Schwalbe Big Apple 26×2.35″ on Surly Large Marge.  This is a 36 hole, asymmetrical rim in the double wall DH version, weighing in at 1150g.

187

I decided to ride the Pugsley as an experiment.  It is an experiment in multi-functional bike design, but also in the bicycle lifestyle where one “bike” can transport me through a snowy winter, a season of exploration around the continent, and then through the challenges of riding bikes in rural southwestern US and Mexico, on rough tracks and trails.  I’d like to ride this thing in the Sierra Madre and the Copper Canyon, or perhaps the playas and arroyos of Baja.  Perhaps a Baja fatbike and packrafting trip is in the cards.  I want only one bike, but I want to travel without limitation.

It’s hard to leave behind my 1985 Schwinn High Sierra, which I’ve ridden over the last two years of bike touring.  It passes paved miles casually, and excels on most dirt roads.  More rough terrain challenges the bike and rider, but I was riding 1.75″ tires and slightly bigger rubber could have extended the range of the bike, at the expense of the the paved experience.  When I arrived in Alaska this past December, I came prepared with a secondhand Pugsley purchased in Seattle.  A 1985 Specialized Stumpjumper also awaited with a pair of studded tires for icy conditions.  Thus, I had two bikes: a snow bike and an ice bike.  Come summer, and the touring season, I looked for a one-bike solution.  The problem was, I couldn’t stand the thought of leaving the capacity for 4″ tires behind, but riding fat bike tires on the road down to the lower 48 didn’t sound like fun either.  I could ride the Stumpjumper, as I had the High Sierra?  Rather, I thought it would be fun to ride the Pugsley on singletrack later in the summer, in places like Colorado, Utah, and Arizona.  In the Pugsley, I had found a rigid frame that would allow me to explore new places.  But what about the transport phases where miles of paved roads are necessary?  I enjoy riding pavement at times, and a long day in the saddle can easily land you 100 miles closer to a destination, or an interesting trailhead.  Sometimes you just have to get somewhere.

I considered several solutions to “generalize” the functionality of the Pugsley.  Alternatively, I was looking to “optimize” it towards multiple different riding conditions, including: paved road touring, dirt road touring, and eventually, single track or sandy rides on 4″ fat tires.  And if I returned to AK for the winter?  I considered, in theory or in practice, the following modifications and judged their merits especially based on price, convenience and performance:

1) Build 29″ wheels front and rear for an all-road tourer such as the Salsa Fargo.  While 29×2.1-2.3″ tires would take me far, I would build, ship, or buy fat tire wheels later in the summer when I desire the extra suspension and floatation.  I would also have to ship or source fat tires at that time. 

This requires the cost of a new set of wheels, which are not prohibitively expensive on the Pugsley as it uses 135mm hubs all around, unlike the more expensive 170mm hubs on other fat bikes.  Wheels would need to be built or shipped later in the trip, which is complicated and a little costly, especially if the expense comes when I am not working.

Below, as far as I got with 29″ wheels before the obvious complication (and cost) had me looking for other solutions.  The rear wheel used a SRAM 506 hub, which is a quality loose-ball bearing hub with a taller non-drive side flange, which is optimal for dealing with the 17.5mm offset of the Pugsley as it reduces the spoke angle and tension on that side.  I rode this half-fat setup for several weeks with a Schwalbe 29×2.35″ tire in the rear.

20110101 000000 0153

2) Ride fat tires (4″) all summer and avoid pavement.  It’s not impossible to ride pavement on fat tires, but it’s not optimal for long stretches.

Twenty five psi in the Surly Larry or Endomorph tires, or the 45North Husker Du tire make for a better ride on pavement than you’d expect.  It’s a little heavy, but it rolls well.  Still, for the cost of the tires, it’s absurd to wear them out in almost exclusively paved conditions.  It was tempting to retain full fat bike capacity, but I wouldn’t have experienced days of good “road” riding, pushing twenty or thirty miles at a time to roll over a hundred miles in a day, and by the time I reached Montana, my tires would be toast.  Elsewhere, fat tires would be a great excuse to stick to dirt, but 2000 highway miles stand between me and the dirt tracks of the lower 48.

3) RIde fat bike wheels all summer (wide rims, such as 65mm Surly Large Marge or Marge Lite), with a smooth 2.25-2.5″ tire for mixed road riding, including many paved miles on the AlCan Highway.  Buy some fat tires later in the summer, and mount them to the existing wheels.   Sounds simple, but does it ride well?

This solution was a revelation, as most discussions of retrofitting a fat bike for alternative uses focus on 29″ wheels and the available rubber, such as smooth touring tires and 2.1″ knobbies.  For the Surly Pugsley, which has a higher bottom bracket than most fatbikes, the smaller tire does not lower the bike enough to create any issues in use.  Actually, the BB height of a Surly LHT (26 x 2.0″ Schwalbe Big Apple) and a Surly Pugsley with 26×2.35″ Schwalbe Big Apple tires (on 65mm rims) is almost exactly the same.  The Big Apple rides well on pavement and is relatively long-wearing (with a reflective sidewall!); it features enough volume to be capable and comfortable on dirt roads, and opens up some more challenging riding as well.  With these tires, I could ride every place I’ve ever toured before.  The trick: when I decide to ride some Coloradan singletrack or the beaches of Baja, I only need a pair of 4″ fat tires to be riding fully fat again.

A pair of Maxxis 26 x 2.4″ Holy Rollers mounted to Surly Large Marge rims got the ball rolling on this project.  I prefer the Schwalbe Big Apple for mixed terrain which includes pavement.  Medium-wide singlewall rims with cutouts such as the Surly Marge Lite can lighten the bike and make “road” riding on a fatbike more tolerable.

20110101 000000 0140

There is no harm in riding a bike with unused tire clearance– better to have it, than to wish for it.  A large volume tire serves multiple functions: with higher pressures, it rolls well on smooth terrain, but with lower pressure it suspends, and floats and provides traction.  An undersized tire may roll fast on smooth surfaces, but will quiver as the road turns rough.  It is often stated that a narrower tire is a “faster” tire.  This does not hold true when the road turns rough, where a large tire may be faster.

20110101 000000 0187

I’d realized how versatile fatbikes could be earlier this winter.  At the time, my discoveries were focused on the Salsa Mukluk which is better suited to a 29er conversion than smaller 26″ tires for summer trail riding or touring.  It also readily accepts a suspension fork.  See “One bike for all seasons” for my previous thoughts on riding fatbikes all year.

My experience nearly plagiarizes Joe’s decision to ride his Pugsley in South America, despite a perfectly good Surly Long Haul Trucker in waiting.  Discussions of function aside, fatbikes are fun and we’d both hate to travel somewhere fun without them.

About these ads

6 thoughts on “One bike for all seasons, Part 2

  1. What is / would be the load capacity on the 26″ X 4″ tires ? Still at relatively low tire pressure ?
    Not much mud or snow around here , would the fat tire still ride well in sand / rocks ?
    Thanks

    • Hans,

      Since this post was written in June I have spent the entire summer touring on the Pugs and I am now in New Mexico. For some reference, this post summarizes my route this summer and the evolution of the bike: http://gypsybytrade.wordpress.com/2012/10/30/pugsmorphology/

      I’m curious to know what kind of ride you have in mind?

      Leaving Anchorage, my front wheel was built with a lightweight Marge Lite rim. Now, both of my wheels are built with lighter rims, which were once supposed to be for use on snow and soft surfaces only. They have not given me a bit of trouble and I have ridden thousands of miles with an average touring load (although concealed in a unique luggage system, it is not lightweight). Some of this riding has included very rough tracks and trails, including several weeks on the Great Divide Route, the Colorado Trail, and assorted dirt trails and jeep roads in Colorado and New Mexico.

      I cannot suggest a specific load capacity on the fat tires, except that it must be “a lot”. The tires are stout, even the lighter weight models, and have resisted sidewall cuts and general rock and trail damage. However, from the perspective of ride quality, I would recommend a light load if possible. While a lightweight load is beneficial in virtue of less weight, simply, a heavy load challenges the positive ride quality of fat tires. For instance, on a rocky trail with a heavy bike you must operate at slightly higher pressures than you might prefer, thus the bike may feel bouncy and traction may not be optimal. Tire pressures are often chosen as a balance of suspension and traction– not too soft to avoid pinch flats and not so hard that the bike bounces; but soft enough to have as much traction as needed. The tires are an effective, if rudimentary, suspension system. Adjusting tires pressures helps tremendously.

      My loaded weight would vary as much as 10-20lbs with food and water, and I can say that I prefer the ride quality at the low end, about 65-70lbs, plus rider weight of about 155lbs. For reference, a 20 lb variation on a typical touring bike does not change the ride very much in my opinion, except that the climbs are a little slower. The “challenges” of riding fat tires are really just a feature– a highly tunable system.

      As for flotation, whether sand or snow, the bike will perform in relation to the size of the tire footprint (rim and tire size, as well as pressure), and the weight of the bike. Bigger tires, lower pressures and lighter loads will make life a lot easier. Of course, the nature of the surface is also important.

      nicholas

      • Thanks nicholas

        So I wont have any sidewall wobble at lower pressures . Even with my 6′ 6″ 1/8 ton body ,riding trails . I may try a 29er as well , for longer street / trail rides .

  2. What is the highest pressure you have had for long periods of time. I am currently having a local bike shop build up a surly 1×1 for city use. Trying to decide between velocity p35 and large marge lite. Also have you used the maxis hookworm tire? They are 26×2.5 and one of the tires I’m looking at. Your adventures sound fun, and I’m enjoying reading them. What great large marge rim test work!!!

      • Jason, I wouldn’t have any concerns of tire pressure. I assume you are concerned about the cutouts and their effect on the rimstrip/tube? I had a hard time seating the 2.4″ Maxxis Holy Rollers, so I think I ran them up to about 40-50 psi. Otherwise, I’ve mounted 3.7/3.8″ fatbike tires with as much as 35-40 psi. I put two rimstrips on one rim, but later I removed it.

        Even for road riding and urban use, you will likely be running no more than 30 psi on 65mm rims. I suspect my maximum road pressure with Big Apples on Marge rims is about 30 psi, although frequently much less.

        I really like the versatility of the P35. The Marge Lite is an easy choice if you want a do-it-all winter bike. I know plenty of Alaskans that have been riding modified 1x1s for years (on Snowcat rims; 44mm, cutout Sun Doublewide downhill rims, 40mm). The ride with a smooth tire is fast on pavement and still capable of some rough stuff. I chose Schwalbe tires for their durability, reflective sidewall, and puncture resistance. I know the Hookworm is a tough tire, but the Schwalbe tires were quite a bit lighter as well.

        Some other tire considerations: Kenda K-Rad 2.5″, Kenda Slant Six 2.5″, and many other mtb/DH tires for winter use.

        Sounds like a cool build. Enjoy!

        nicholas

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s