This is a shameless attempt to save the the most advanced civilization in
history from imminent self destruction by eliminating carbon emission,
dependence on foreign sources of fuel,obesity, hypertension and diabetes.
Cycling accomplishes all those things at once and helps us develop a better
understanding of ourselves, each other and our relationship to the cosmos.

Oh, horse puckey!
I like to ride bikes, have been doing it all my life.
The rest of that crap is just a fringe benefit,
and the blogosphere gives me a chance to share my interior
monologue with virtual rather than imaginary friends.

Friday, May 9, 2014

BM Dymotec 6 weight

I got really sick of arguments about the pros and cons of tire driven dynos.
One of the benefits has always been that they are lighter than hub dynos.
Arguments fly when you bring it up because it's hard to find a weight for reference
 from any of the dyno makers out there.  
My BM Dymotec 6 weighs 180 grams, give or take whatever margin for error there is from using a cheap food scale and reading it after scientifically preparing for the event with several drinks.
I felt it so important that I titled this post so millions of people wondering could find
an approximation of an unqualified opinion on Google without trying.
So there, that means it adds about 300-700 grams less than a dynohub, depending of course upon several variables like what brand of dynohub and which normal front hub you use for comparison.
So the tire driven dyno is probably lighter and produces absolutely no drag when not in use.
I mean no drag, I realize that most dynohub owners say they don't notice any, but it's there.
I'll tell you the same thing about the weight of my Hunq, but it still rides a lot slower than my roadie.
If I was riding in the dark on a daily basis, I would opt for a dynohub, but I don't.
So, despite that dynohubs are the newest greatest shiny around, I don't need one.
While we are discussing information which is totally obscure and useless, Strava is selling it's accumulated nonsense to traffic engineers who can spend our valuable tax money tracking the behavior patterns of spandex hamsters.  Giving credit where it is due, The Bike Snob posted some information on his blog about this.  I thought I would pass it on because, if you are like me, you miss some of his posts when you get tired of reading about  genitalia.  He says cool stuff  most of the time, but reminds me of the kid on the playground who couldn't quit talking about personal body parts and secretions.  The cool stuff he brought up was that Oregon (of course) paid Strava $20,000 to find out that 17,700 subscribers rode an average of 282 miles per year.  That information produced a "heatmap" like the one above which traffic engineers will assume provides information about bicycle movement.  You might as well be watching rodents in a cage.  I ride nearly that much in a week and actually go places.  People on Strava occasionally ride around in circles to impress their friends. I think Strava provides useless information, but then I ride bikes all the time.  What would I know?   The majority of their customers seem to be riders tracking the month to month consistency of  one club ride they attend,  or guys who need something on their handlebars to remind them of the dashboard in the BMW they left back in the parking lot.  It's not about information, it's about creature comfort.  We can only hope that traffic engineers know enough about math to understand that 282 miles a year is not representative of real cycling, but, we are talking about bureaucrats.


  1. Hi, I would actually like to know more about the Dynotek you are using. What light are you using with it and how much drag do you notice when using it?

  2. I just switched to the BM Eyc for a head light and have been using the BM Toplight Line Brake Plus. Both are excellent. The drag can be variable. I set the tension very light for dry conditions and tighten it for wet or icy conditions. When it's dry, I actually forget it is on sometimes.

  3. Thanks for another excellent post, Marc. More entertainment, with useful information included, as usual.