Wednesday, August 27, 2008
Monday, August 18, 2008
Wednesday, August 13, 2008
Jon Billman's Great Divide Story

In 2007 Jon Billman competed in the Great Divide Mountain Bike Race. His terrific story of the race appears in the August 2008 issue of Outside Magazine and can be read online here.
Tuesday, August 12, 2008
Bicycle Zombie Slayer

Monday, August 11, 2008
Nashbar Front Rack

While there are plenty of rear racks available for bicycles, front racks are harder to find. The Nashbar Front Rack
Sunday, August 10, 2008
Goodbye StuM2y, Hello Special Ed
Astute readers of this blog might have noticed that I have a bit of a fondness for bicycles. Long time readers may have also noticed that on any given day "my bike" may be in fact a different bike than the one I owned yesterday. Managing a place like Bike Works certainly provides me with lots of opportunities to experiment. Edison once said "To invent, you need a good imagination and a pile of junk." Bike Works is the ultimate junk pile. My friend Mark Vande Kamp put it a bit differently, "you're like a drug addict whose managing a pharmacy!"
The latest bike out of the lab is what you see here. Special Ed is an old Specialized Stumpjumper but, as I pointed out to my wife, my personal bike fleet still remains at three: I have one road bike, one mountain bike and one folding bike. Special Ed replaces StuM2y, my previous Specialized Stumpjumper.
So why replace one Stumpjumper with another? Aside from the obvious "because I can" answer, Special Ed differs from StuM2y in a couple of ways. StuM2y had a red, aluminum frame with vertical dropouts. Special Ed's black, Cr-Mo frame has semi-horizontal dropouts.
Special Ed comes from that brief period of time when people thought putting a U-brake underneath the chainstays was a good idea. In hindsight it seems obvious that putting a brake in a spot where it can get bashed by rocks and gather up all the crud kicked off of the crank is a bad idea but a lot of crazy things came out of the 80's. At least Special Ed doesn't sport one of those neon purple and green Miami Vice paint-jobs.
Even before he knew I was building it up for myself, my colleague Dan Boxer commented that Special Ed looks "like a Kent Peterson bike."
Black tape over the most garish logos. Custom coroplast fenders stealthed up with black duct tape and set up for massive mud clearance. Armadillo tires. Front and rear racks. And just one gear. 46 by 20 fixed.
Riding fixed means I can gladly toss that U-brake in the parts bin. The deraillers and the extra chainrings and cogs go there too. The rear wheel gets re-spaced, re-dished and the 20-tooth cog got stomped on good and tight. Note that if I was building this bike for anyone else I'd probably either go with a real fixed hub with a lockring or dual brakes but I'm willing to trust my own life to my gear-stomping, lock-tighting and judicious use of my big old Kool-Stopping front brake. If anybody wants to know how to do this kind of conversion, Sheldon has a great page on the subject here.
I donated StuM2y to Bike Works Friday morning and sold it to a commuter about an hour later. I rode Special Ed home Friday night
Thursday, August 07, 2008
Why Fixed Gear Bikes Are Better On Ice
We're in the midst of what passes for a heatwave here in the Pacific Northwest and somehow I find myself involved in an email discussion about setting up a bike for riding in icy conditions. I'm reminded that I heard once that Jack London wrote one at least some of his famous Yukon stories on a sweltering passage through the tropics and in that spirit I've extracted (with the permission of the other emailers) bits of our discussion of how Nate should build up his winter bike.
Nate wrote:
Fixed definitely has the edge in dicey conditions. You know exactly how much traction you have. I blogged about that phenomena here:
http://kentsbike.blogspot.com/2006/02/icy-commute.html
Note, this post predates my days of studded tire ownership. But the ultimate winter commuter would be a fixie with studded tires.
Michael then asks:
That would be because you're never not pedaling on a fixed. You don't think you'd get the same effect by never coasting? ie, is the fixed benefit because it's already there by default.
Nate adds:
The rear wheel I'll be using is a flip flop, so I'll try it both ways and see how it goes.
I'm taking my frame/fork in for a fresh powder coat this week and will begin building it back up, hopefully finishing before the weather gets cold. Because of clearance concerns, I'll probably go with the Nokian A10 700x32. Even though this is the smallest available 700c studded tire, fender clearance is still going to be tight, so I may be ashioning my first ever set of custom coroplast fenders.
Kent clarifies the fixed advantage thusly:
Michael, here's why the fixed on ice is NOT THE SAME as a single speed. First off let's assume that you actually never do coast your single speed. That makes you absolutely unique on the planet, BTW and leads to the question of why you bother lugging a freewheel mechanism along in the first place. But let's say you do that. Now let's take the case of deceleration, also known as slowing down. You can only slow by applying your rim or disk brakes. In both cases, the mechanism is the same, pads that interface with a rotating surface. Since brakes don't just stop you instantly (you wouldn't want them too!), the brake pads slide along the rotating surface. You increase and decrease pressure to control your velocity.
But (and this is the important thing) you have no way of knowing what slip you are getting comes from the pad/rim interface or the tire/road interface. So you think "hmm, I'm not slowing fast enough, maybe I'll squeeze the brakes more. If the slip is in the pad/rim interface, that will slow you more but if the slip is in the tire/road interface, you worsen your skid.
On the fixed, much of your velocity modulation is via your legs. Even when you use your other brakes, you get the feedback of your legs together with the action of the other brakes. This lets you do the same kind of calculation a modern automobile does when applying its anti-lock brakes, comparing the rotating speed of the wheel with the braking inputs to determine if a wheel is skidding. On a fixed gear bicycle, your brain can do this automatically, in real time. On a coasting bike, you don't have the data to do this calculation.
While slips and skids are most common in deceleration, they can also occur on acceleration. Wouldn't a freewheel and fixed be equal there? Nope. Even a very tightly engaging freewheel mechanism (say a Chris King) will have a bit of slop before it engages. Fixed gear bikes also are never perfect and have a bit of slop but it's almost always less than the slop in a freewheel. And when pulling out from a stop, it's hard to tell if the slip you are getting is from slop in the drivetrain or the tire slipping on the road. Minimizing drivetrain slip makes road slip more noticeable.
Finally, in sub-freezing conditions, freewheels sometimes become sluggish in having their pawls engage. Back in Minnesota every winter I'd see freewheel pawls freeze, making the freewheel spin freely in both directions. Running light lube in the mechanism and keeping water out usually prevents this, as does warming the freewheel/freehub above freezing but fixed gear drive-trains are immune to this particular problem. Various riders on rides like the Ididasport and the Arrowhead 135 have kept a fixed cog in reserve for extremely cold conditions.
Nate wrote:
Fixed or SS?
Any benefit to either in inclement weather?
Michael replies:
You don't get that dérailleur thingy all covered in the omnipresent road grime.
If you go SS you can't join the Sunday morning rides out of River City Bikes.
Real suggestion: get a flip wheel and find out for yourself.
Kent adds:Michael replies:
You don't get that dérailleur thingy all covered in the omnipresent road grime.
If you go SS you can't join the Sunday morning rides out of River City Bikes.
Real suggestion: get a flip wheel and find out for yourself.
Fixed definitely has the edge in dicey conditions. You know exactly how much traction you have. I blogged about that phenomena here:
http://kentsbike.blogspot.com/
Note, this post predates my days of studded tire ownership. But the ultimate winter commuter would be a fixie with studded tires.
Michael then asks:
That would be because you're never not pedaling on a fixed. You don't think you'd get the same effect by never coasting? ie, is the fixed benefit because it's already there by default.
Nate adds:
I can see benefits to both ss and fixed in the ice. When approaching a known trouble spot, I like being able to approach it in a confident position and coast through it without changing position or momentum on the bike. Just passing silently like a ship through the fog.
But I can see the benefit of fixed for the overall trip. More instant feedback of what you are riding over.
The rear wheel I'll be using is a flip flop, so I'll try it both ways and see how it goes.
I'm taking my frame/fork in for a fresh powder coat this week and will begin building it back up, hopefully finishing before the weather gets cold. Because of clearance concerns, I'll probably go with the Nokian A10 700x32. Even though this is the smallest available 700c studded tire, fender clearance is still going to be tight, so I may be ashioning my first ever set of custom coroplast fenders.
Kent clarifies the fixed advantage thusly:
Michael, here's why the fixed on ice is NOT THE SAME as a single speed. First off let's assume that you actually never do coast your single speed. That makes you absolutely unique on the planet, BTW and leads to the question of why you bother lugging a freewheel mechanism along in the first place. But let's say you do that. Now let's take the case of deceleration, also known as slowing down. You can only slow by applying your rim or disk brakes. In both cases, the mechanism is the same, pads that interface with a rotating surface. Since brakes don't just stop you instantly (you wouldn't want them too!), the brake pads slide along the rotating surface. You increase and decrease pressure to control your velocity.
But (and this is the important thing) you have no way of knowing what slip you are getting comes from the pad/rim interface or the tire/road interface. So you think "hmm, I'm not slowing fast enough, maybe I'll squeeze the brakes more. If the slip is in the pad/rim interface, that will slow you more but if the slip is in the tire/road interface, you worsen your skid.
On the fixed, much of your velocity modulation is via your legs. Even when you use your other brakes, you get the feedback of your legs together with the action of the other brakes. This lets you do the same kind of calculation a modern automobile does when applying its anti-lock brakes, comparing the rotating speed of the wheel with the braking inputs to determine if a wheel is skidding. On a fixed gear bicycle, your brain can do this automatically, in real time. On a coasting bike, you don't have the data to do this calculation.
While slips and skids are most common in deceleration, they can also occur on acceleration. Wouldn't a freewheel and fixed be equal there? Nope. Even a very tightly engaging freewheel mechanism (say a Chris King) will have a bit of slop before it engages. Fixed gear bikes also are never perfect and have a bit of slop but it's almost always less than the slop in a freewheel. And when pulling out from a stop, it's hard to tell if the slip you are getting is from slop in the drivetrain or the tire slipping on the road. Minimizing drivetrain slip makes road slip more noticeable.
Finally, in sub-freezing conditions, freewheels sometimes become sluggish in having their pawls engage. Back in Minnesota every winter I'd see freewheel pawls freeze, making the freewheel spin freely in both directions. Running light lube in the mechanism and keeping water out usually prevents this, as does warming the freewheel/freehub above freezing but fixed gear drive-trains are immune to this particular problem. Various riders on rides like the Ididasport and the Arrowhead 135 have kept a fixed cog in reserve for extremely cold conditions.
Wednesday, August 06, 2008
Sweet Bear-Loving

OLYMPIC LOOP CAMP------------------------------------------
--------------------------
WELCOME TO ANIMAL WORLD
HARDCORE 101 TOILETRIES
-------------------------------------
NO SHAMPOO/CONDITIONER
& ONLY MINI SOAPS PLEASE
NO DEODORANT, SCENTED LOTIONS,
COLOGNE, MOUTHWASH, GUM OR SWEET
BEAR-LOVING SMELL PRODUCTS OF
** ANY KIND **
The phrase "sweet bear-loving" has managed to crop up in many conversations over the past few days.
Monday, August 04, 2008
Biking With Brad
Normally, my virtual weekend is Sunday-Monday, but this past week a visiting friend and the scheduling needs of one of the other mechanics at Bike Works let me swap my days off. As it turns out, plans to go camping with my visiting pal didn't work out but we had a nice visit at the shop on Thursday morning. Another buddy of mine, Brad Hawkins, had independently cooked up a bike trip out along the Iron Horse Trail for Friday-Saturday so Brad and I had a great trip.
Brad recently got himself one of these blog-thingies of his own, so you can read all about our trip and see some pictures by going here:
http://tinyurl.com/68kqr3
and here:
http://tinyurl.com/54ux7c
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