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I've got a bike in my garage that illustrates the proportional length crank philosophy that is one of the cornerstones of the design philosophy of Zinn Cycles.  It's not a Zinn bike - but even so - it's still pretty cool...

It's fairly new and very specialised in that it's a tandem that my wife and I ride with our special needs son Ted...

The bike is a Hase Pino tandem where the pilot is at the rear and the stoker is on the front in a recumbent position.  And Ted isn't tall enough yet to reach the pedals on the adjustable boom at the front - so he uses "Kiddie cranks" that are temporary.

As you can see from the photo the kiddie cranks interrupt the regular chain line and are clamped in place.  So there are 2 sets of cranks of the front - eventually he'll use the longer cranks on the front (which are on a sliding boom) but for now he uses the much shorter kiddie cranks.  Proportional length cranks on display!  Short cranks while you're short - and longer cranks when you are taller.  Makes perfect sense.  Only problem being - that for the vast majority of bikes - it's only proportional up to adulthood - when the range of crank lengths becomes very small - yet the difference in size of adults is vast...

Here's Ted and I and the whole bike (so you can make sense of the above photo)...

So what else have I been up to?

Well - Ted and I rode the tandem in a 6 hr relay - so I've been doing a bit of riding on the tandem - but still on my Zinn at every opportunity.  It's interesting going between the tandem and the Zinn - going from 175mm cranks to 210mm cranks.  You immediately notice the difference when gettting on the Zinn - but within a few hundred meters it the noticeablity goes away and it you are back into the world of comfort and increased ability.  When riding the tandem - the noticeabilty doesn't go away - and as it's a big heavy bike (and because Ted isn't able to contribute much) I'm constantly wishing it had longer cranks - especially when we get to a hill..

I did get a lesson in "being prepared" the other morning.  I set off on a ride to work - with 2 mates.  Early start - riding in the dark - and as it was so early - I decided to skip breakfast.  Mistake!  The guys I was with were faster than me - so that put me under a bit of pressure (which is normally fine - and benificial).  But when we got to a good sized hill about 10km into the ride - I started feeling dizzy and struggled big time.  Halfway up I decided that I'd had enough and said my farewells to my companions and rode home again.  Combination of late night and no food I think was the problem.    Completely underprepared!

Heading off on an early morning commute

Other than that - I'm still riding - not as often as I'd like in the last couple of weeks - but still riding.

Cheers

Adrian

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