Calories Burned While Pulling a Bike Trailer

Matt Pulling Malcolm in His Bike TrailerAs I pull my kid around in his bike trailer, other cyclists pass me as though I am stopped on the side of the road changing a flat. I console myself by counting trailer miles twice.

Ten miles pulling the trailer should go in the log book as 20 miles, right? That’s my rule of thumb. Calories burned per mile? Double that, too!

The truth ain’t that far off, the math is fairly simple, the variables, however, make this a matter best left for scientists and philosophers.

Calories Burned While Cycling

Speed and weight determine calories burned:

  • 15 mph = 0.049 calories per pound per minute
  • 25 mph = 0.139 calories per pound per minute

Calories burned per pound per mile ridden is not a linear function — going from 15 miles an hour to 30 miles an hour doesn’t double your calories burned. Drag is proportional to the square of speed. Thus overcoming drag at higher speeds results in far more calories being burned. Just trust me when I say Aerodynamic drag is complicated and let’s do some examples

Cyclist at 130 Pounds

  • 15 mph = 0.049 calories * 130 pounds = 6.37 calories per minute
  • 15 mph = 25 calories per mile
  • 25 mph = 0.139 calories * 130 pounds = 18.07 calories per minute
  • 25 mph = 43 calories per mile

Cyclist at 180 Pounds

  • 15 mph = 0.049 calories * 180 pounds = 8.82 calories per minute
  • 15 mph = 35 calories per mile
  • 25 mph = 0.139 calories * 180 pounds = 25.02 calories per minute
  • 25 mph = 60 calories per mile

Cyclist at 220 Pounds (ie: me)

  • 15 mph = 0.049 calories * 220 pounds = 10.78 calories per minute
  • 15 mph = 43 calories per mile
  • 25 mph = 0.139 calories * 220 pounds = 30.58 calories per minute
  • 25 mph = 73 calories per mile

Calories Burned While Pulling a Trailer

My nearly four-year-old son clocks in at 45 pounds. His trailer weighs about 30 pounds. He has another ten pounds of toys, snacks and drinks. That means I’m hauling around 85 more pounds.

Since I’m positive I’m not going 25 miles an hour while pulling the bike trailer, let’s isolate just that 85 pound load at 15 miles an hour…

  • 15 mph = 0.049 calories * 85 pounds = 4.165 more calories per minute
  • 15 mph = 17 more calories per mile

That means it takes 40% more energy to pull the trailer than to just drive myself around, all else being equal.

As a 220-pound cyclist, it costs me 43 calories per mile to ride. Toss the trailer on there and I’m burning roughly (very roughly) 60 calories per mile.

For a lighter biker, the trailer is a larger percentage of the total weight involved in the trip. As such, the lighter the rider, the more meaningful the increase in calories burned while pulling the trailer. Continue reading “Calories Burned While Pulling a Bike Trailer”

Steel Bike Frames Go Soft and Stretch

Seat Post Clamp with No Room to TightenDuring my normal Saturday morning ride, I started getting less and less comfortable. Ten or so miles in, my knees felt as though they were going to hit my chin when I was in the drops. What was happening?

Simple answer: my seat was slipping down.

By the time I got off the bike to see what was going on a few miles later, I had lost nearly two inches of the seat post down the tube. Not good but fairly typical of an old, steel bike.

Steel Bikes Go Soft and Stretch with Age

My bike and I both are going soft with age. As you can see from the picture, the top of the frame where the seat post sits is touching. There should be an air gap there when the post is tight. As the frame ages and stretches, you loose the ability to really clamp down on the seat post.

(Also note that the rubbing of the bike bag has worn away at least two layers of paint.)

Broken Seat Post Bolt

Might Makes Right — Or, Not

Being a well-prepared cyclist, I had the right size hex wrench in my bag. Until I had a chance to shim out the seat post with a cut-up aluminum soda can, I could just really crank down on the clamp and it would hold this one last time.

My bike had other ideas. It was tired and it wasn’t going to take it anymore. When I give the bolt a half-twist, it shattered and shot nearly eight feet away.

Crap.

I’m fifteen miles from the starting point and my seat is now flush with the frame. This is a six-inch difference from where I would normally ride. Not fun. The nearest bike shop is seven miles. I couldn’t think of anywhere nearby that would have a bolt at eight in the morning.

J-Town Bikes and Ace Hardware to the Rescue

Fortunately, I ran into Richard who works at J-Town Bikes. He biked up into the same Circle-K parking lot as I was sitting. He suggested I try the Ace Hardware store not two blocks away. I never would have known it was there. (Richard also was the one that gave me the soda can idea for the permanent fix.)

Bike Seat Post Clamp from the SideSure enough, the Ace Hardware had a bolt that would work until I could fix the bike for good. The bolt and a hex wrench in the new size cost $2.09 and that included tax.

So, you’d think I’d fix the bike as soon as possible to avoid any additional problems, right? That would be he most responsible thing to do.

Three weeks later, I’m still riding with the temporary bolt and without the seat post shimmed out. It still slides a little over the course of a 30-mile ride.

I’m writing today in the hopes that with this public admission that I’ll guilt myself into doing the right thing and getting the bike fixed before this weekend.

Check in with me Monday.

—Matt

Insulated Water Bottles vs. Uninsulated (BPA?)

Today, my cycling friends, I’ll be discussing the difference between insulated water bottles and uninsulated water bottles. I’ve done extensive testing and am ready to present my results.

If you’re the lazy type, look at the pretty chart (shamelessly borrowed) below and then buy a BPA-free 24-ounce Polar Bottle.

Why do you need cold water? Or water at all?

Insulated versus Uninsulated Water BottlesIt is hot.

I realize that South Florida hot isn’t the same as Arizona hot or Africa hot but it is still pretty darn hot. Add in our world famous, not available in stores, humidity and bike riding is punishing. Keeping well hydrated is absolutely necessary, not just to maintain performance but for survival.

With an uninsulated bottle, water reaches air temperature in less than half an hour on my bike.

I used to ride with an iced-up Camelbak and there was usually still ice in the bag four or five hours later. Yummy! It worked great but I never liked the heavy weight and the massive reduction of air flow across my back.

Freeze Water Bottles Overnight

For the last two years, I have been freezing my water bottles overnight 3/4 full then putting cold water on top right before I leave the house. A large, solid chunk of ice kept the bottle cold about twice as long as did ice cubes.

Even then, that just means cool water for an hour.

My normal Saturday morning group ride is 31 miles and we are out there for an hour and a half. Not even to the turn around point, my water is 85 degrees. Yeah, it’ll keep you hydrated but it is not at a temperature which would encourage you to drink.

You want me to spend how much on a water bottle?!?!

Over the years, I have amassed quite a collection of free water bottles…

Water Bottles of all Shapes, Sizes and Materials

Just about every event I do, there’s a free water bottle available. I bet I have 20 of them in the garage. The low end bottles have tops that sometime leak. The higher end bottles are acceptable in every way shape or form with the exception that they don’t keep the water cool.

Did I mention they are free? Until a couple weeks ago, I had never actually paid for a water bottle. It seems almost seedy, maybe reckless, to pay for a water bottle. It would be as though I were lighting my BBQ grill with $10 bills.

Hello, my name is Matt and I paid about $10 for an insulated water bottle.

So, do insulated water bottles really work?

Continue reading “Insulated Water Bottles vs. Uninsulated (BPA?)”

2001 Bianchi Talladega — My New, Used Bike

Before: 1998 Trek 7300 Urban/Bike Path BikeMy new, used 2001 Bianchi Talladega is an awesome bike and a huge step up from my frankensteined Trek 7300.

First, a few words about the Trek 7300. I bought it in 1998 shortly after moving to Orlando. I didn't know anyone in town and figured that with an empty social calendar I could get some exercise. I stopped by the local bike shop (Bike Works, MetroWest location) and told them what I wanted — a low-end road bike. When they told me that would cost $800, I asked them what they had for $500. That brought me to the Trek 7300. I swapped out the straight bars for drop bars and rode it for the next ten years. After eight years, the head tube cracked and Trek replaced the frame (under warranty) with a Trek 7700 frame. I even managed to do a century on the bike.

Still, it was a beast of a bike. Naked, it weighed in at 22 pounds. Add in the lights, rack, generator hub, ham radio, MP3 player with handlebar-mounted speakers and whatnot and it must be 40 pounds. My fault, I know. Still, heavy and slow. It was no road bike.

I had never seriously considered upgrading since all the bikes I lusted after were more than $2,000 and I really had no excuse to spend money on a bike that I rode ostensibly for exercise.

2001 Bianchi Talladega Road Bike

That was, until my (now favorite) Uncle Mark borrowed a full carbon bike for the Tour of Rural Southern Vistas (TOSRV). After tearing up the road on a bike that was lighter than air, he was hooked. Not too long after he got home, he bought a 2008 Trek Madone 5.5. Good for him and better for me. The fine Italian road bike on which he had put more than 25,000 miles, a 2001 Bianchi Talladega, was put out to pasture. (Read about Mark's Bike in his own words.)This is Matt with the box in which his bike arrived.

After weeks of negotiation, begging, whining and small unmarked bills, Uncle Mark put the bike in a box and it showed up at my office. Continue reading “2001 Bianchi Talladega — My New, Used Bike”

Phillip’s Triple-Trailer Bike: Headed to Chicago

Triple Bike Trailer

Phillip, Taking a Break in the Shade on His Way to ChicagoPhillip is headed to Chicago this summer to visit family. Phillip has 1,300 miles or so to go… On a bicycle… Pulling three fully-loaded trailers.

When I saw him sitting in the shade at the side of the road this morning, I had to stop and chat. I'm used to pulling my son around in a bike trailer. All told, him (42 pounds), his toys and his trailer (31 pounds) weigh in at 80-85 pounds. Phillip's convoy is every bit of 300 pounds.

Phillip doesn't know when he'll get to Chicago. He has done the round trip before but didn't keep track of the days, his peak wattage or calories burned. He rides without a GPS.

I wish I had more time to chat but I was running late for work. Below are some pictures. If anyone between Palm Beach County and Chicago, Illinios happens to see Phillip, please post an update to the comments below. I'd love to know what sort of progress he is making.

—Matt
(more photos of Phillip's Bike below)
Continue reading “Phillip’s Triple-Trailer Bike: Headed to Chicago”