So last night I got home from work an hour early and hurtled myself into the bikeBasement(tm), head first, through three partitions and a large timber column. I was THAT motivated.

Drivetrain upgrade time!

So, I started by pulling all the Dura Ace parts off that I was replacing. It’s kind of cool to see both the changes in design philosophy over time, and the differences in problem-solving, especially in the rear derailleur design (I’ll do my best to avoid what happened to Andy Schleck, of course*).

As I was pulling the 9-speed cassette off of my wheel, I discovered I was missing a familiar-looking tool: The Park FR-5 rear cassette tool, which looks similar to a bottom bracket tool I have (well two) but wasn’t quite the same. This is where having a bike shop in Tam Junction comes in handy. I was able to get that tool and back to the basement in about 15 minutes.

Next up, moving cassettes. As you’ve seen from Lung’s videos on the subject (or will, once they are broadcast) modern cassettes come in a combination of single and group pieces. The larger three or four cogs, depending on the manufacturer, are carved out of a single piece of metal, in my case titanium, and then the remainder are single cogs with spacers. They have a specific groove design in the center and fit the hub body a specific way. There’s compatibility issues all over the place, but not for me: while the Dura Ace groupo I pulled would normally suggest incompatibility of my hub with this new cassette, in my case I got lucky, because the wheel I was using was not my ORIGINAL wheel, but a newer one retrofitted to use the 9-speed cassette. I had owned a Cervelo Soloist with a modern 10-speed Ultegra groupo on it (2006) and swapped it for this 9-speed Dura Ace from 97… I had used a spacer and adapter to make the hub work. So now, I was golden for using this new SRAM cassette. Nice! That doesn’t often happen to me…

The cassette comes on a plastic speedloader, much like the ballistic version of same concept. In my case, because of the gears I selected, I had to modify the speedloader configuration, but once I was ready, line up the grooves, slip slip and boom, ALL on. It’s interesting to see the newer cogs and their guide teeth with angled faces. Anyway, quick snap, we were good to go and get back on the bike.

Adjusted the rear derailleur, ran the cable (now the cable housing swings wide up and over the stays) and same with front, swapped out for my new 10-speed chain (swapped out my new 9-speed chain, mind you, grrrr) and set everything, and boom!

Next up, final adjustments. I spent another hour this morning trying to adjust the index shifting with little success. I’m going for expert help…

*If you haven’t seen the footage, Schleck’s chain popped off on his acceleration up the climb in the pivotal moment of yesterday’s stage. There’s lots of controversy about attacking vs. waiting and all this other stuff, but I was more interested in what happened mechanically, as I always am when pratfalls occur in the tour with these guys. They have the best mechanics out there and the best equipment, but the wrenching is happening fast, and sometimes things aren’t adjusted, sometimes parts fail, and sometimes riders err. I’m always curious what it was. In this case, we don’t really know but there’s a good chance Schleck jumped the chain on a heavy shift. The nature of SRAM derailleur design led to the chain drop. IF that’s what happened…

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