A Little Bike Commuting Math

Today, for the first time all week, I didn’t get soaked by rain on my commute home! I’m not complaining about the rain; not really. We’ve had an exceptionally dry November, with an unparalleled number of beautiful Saturdays that let us keep riding our fast bikes far later than usual. I expect to commute home in the rain most days between November and April, so I’ve just enjoyed all these bonus dry days.

Of course, that all changed this week, which we kicked off with 1.4 inches of rain on Monday. I had forgotten how difficult it is to see in the pitch dark in the rain, with raindrops on my glasses and car lights refracting and my glasses fogging up every time I stop.

On rainy days I wear my Gore jacket, which is phenomenal (although I think the colored sleeve patches are soaking through…). But it’s very light, and the directions specifically say “Use with backpack not recommended” — I assume because it wears through too quickly. So on rainy days I take my pannier and go just a little slower. Meh, I’m so slow anyway in these conditions, it honestly doesn’t matter much.

BUT! Today, as aforementioned, it didn’t rain. Plus, I’m working from home tomorrow and have to carry my laptop. For this, I use my Timbuk2 backpack, which has a perfect cozy padded laptop pocket. Okay, honestly I’m not sure if it’s cozy; I’ve never actually cozied up into the pocket, but I imagine my laptop would say it’s cozy, based on how fuzzy and soft it feels inside.

Anyway… I don’t use the backpack most of the time because, frankly, it’s enormous and I don’t need that much volume most of the time. Long story short, today not only did I need to carry my laptop, but I had some extra cargo that required the larger bag.

If only it wasn’t so darn¬†heavy when it’s fully loaded like that. By the time I’m three or four miles from home, my back has started sending out semaphores, flares, etc., to alert me to the level of discomfort I’m feeling. It’s not fun.¬†

I wondered, as I waited at a stoplight and tried to take the bag weight off my poor, long-suffering shoulders and upper back, how much all this hoo-hah weights. I estimated about 10 lbs for the bag, fully loaded.

One of the things about having my brain is that you immediately decide to quantify stuff if you can. So when I got home, I got out the scale and did some quick measurements. A few little calculations later, and I got my answers:

Fully loaded bag, including laptop: 7.4 lbs
All the gear I’m wearing*: 8.2 lbs
Commuter bike with rack, fenders, pedals, lights, bike computer, the works: 22.4 lbs

By far the most surprising thing to me was the weight of all the clothes and gear. It never occurred to me that I’d be carrying that much extra in layers. Maybe that’s part of why it feels so much harder to ride in inclement weather… And, also, my bike was lighter than I expected: I thought previously it weighed in at 27 lbs. Must’ve lost some water weight since then.

In any case, if I’m looking for reasons I’m so much slower commuting now than in June, I probably need look no farther than these:

  • It’s dark and I slow down for safety.
  • It’s wet and I slow down for safety.
  • I’m carrying a lot of extra weight in winter gear.
  • I’m riding my heavier bike all the time now.
  • I ate some extra donuts once I finished that Gran Fondo.

Cyclists are so good at excuses!

*All the gear I’m wearing includes counts the weight of all the extra wintertime gear: helmet with light, shoes, booties, and jacket. It doesn’t count the regular base layer of shorts, jersey, etc. that I wear all the time. In retrospect I probably shouldn’t have included shoes, since I have to wear those no matter what. Oh well.