The real crux of the build, besides which shifters to go with, is just how compact of a chainset I want. Alex Wetmore has a great page talking about the pros and cons of 110 vs 94 BCD cranksets and how compact doubles, especially when you go with something like 46/32 or a 44/31, can actually give you more reasonable chain crossover. When I was looking at gearing tables for 2 x 9 mountain bikes, I pretty much came to the same conclusion. It seems most 2 x 9 mountain drive trains run something like 44 x 29 up front and an 11-34 in the back. Some racers will bump that front chainring to a 46 I guess (or down to a 42) depending on the speed of the course. A 44 x 11 gear gives 104 inches development and a 29 x 34 gives 22 inches (on 26 x 2.1″ tires w/ 175mm cranks). I mean that’s a pretty good spread for off road I’d think.

SO, I’m leaning towards using the more common 110 BCD crankset with a 46/34 up front, unless I happen to win a set of sweet 8 year old Race Face square taper Turbine cranks in a 94 BCD double configuration (or vintage Ritchey Logics) I would say that the advantage of something like a 44/31 setup using an 11-28 cogset gives almost the same range. On my Jake the Snake when we rode across the US I ran a 50/40/30 triple with a 12-32 8 speed cassette in the back and Rivendell “Silver” friction barend shifters. That worked fine. I didn’t find myself fully loaded in 1st gear very often. I’d say I spent most of my time on that trip in the middle 40 tooth ring switching between 24 to 12 on the back (45-90″ development). And as I recall, the real problem was when I shifted up to the 50 tooth ring I really only got two more gears using 50×14 and 50×12 (96″ and 112″ respectively). We generally didn’t go over 18 mph, and as I recall there were only a couple of days when I remember us using having a tailwind and actually using those big rings.

And when Hanka and Katie battled it out for 1st at Pijnacker this past weekend? Well sadly the Rainbow Colors didn’t win it on SRAM Double Tap technology, but it was a good battle nonetheless.

For the record, I did get the 7200 RPM Seagate 320GB hard drive to fit the MBP and upgraded the Airport mini PCI card to 802.11n Extreme.   It goes  pretty well over the Time Capsule for backup with Leopard’s Time Machine.  Yes, I upgraded to Leopard too.  And it boots way way faster than Tiger ever did for whatever reason (not just the 7200 RPMs).  I slip-streamed XP Service Pack 3 and then did the whole Boot Camp installation on a 100 GB partition, SolidWorks Student Edition worked fine which was something of a relief for me.

Also, I have a new 2009 Trek XO2 frame to ride off the pavement of New York.  There are a few more ‘cross races this season and I’m not sure if I’ll be able to make them all as they tend to be 1-2 hours away in Jersey and it’s like $30 per race.  My hopes are to ride the Croatan Aqueduct trail, do the mountain bike loop in High Bridge Park in Harlem, and perhaps take Metro North and ride some of the trails in the Hudson River Valley.  There is a race weekend in the Hampton’s and with entry to a citizen’s race your number is entered to the raffle for a Richard Sachs’ custom cyclo-cross bicycle complete with full SRAM kit (so as to skip the 7 year waiting list and selling of kidney).

My new ride the Trek XO2

Richard Sachs - The best of handmade steel