Cog blocked

 Blue is almost but not quite perfect. The gearing covers a little wider range than on my original Cross Check. As I’ve put more miles on, I noticed that the steps in the cassette could be a little more even. What’s on there is 13-15-17-19-21-24-28-32. 

On the green bike, I had added a 30 to a seven-speed block with the same gears that the blue bike has, only culminating in a 30 instead of a 32. So the intervals from the 13 to the 30 were 2-2-2-2-3-4-2. By subbing in a 27 for the 28, I made the intervals 2-2-2-2-3-3-3.

Large intervals and strange intervals mess with your cadence and power. On the 13-32, I wanted to Frankencog a 22 for the 21 and a 25 for the 24. That would make the intervals above the 19 go 3-3-3-4. At least three of my bikes have cogsets I assembled for them to suit my needs. I have a cog farm at home, and we have a deeper one at the shop.

A 12-25 used to be common on road bikes in the late 1990s. Some riders still ask for gearing that high. Surely a 25 lay in the big treasure chest at work. The 22 might be more challenging, but I remembered some combinations that had not interested me before that might contain one.

Nope. No 25, no 22. A search for new cassettes turned up one, described as a downhill mountain biking cassette, that had a 25. I’m not going to shell out for a whole cassette just to scrounge two cogs. The industry has cog-blocked me. Maybe a 25 will turn up eventually, but without the 22 it only creates a weird 4-3-4 sequence in the lowest three gears.

I should have bought up as many Miché cogs as I could get, back when they were available. I used some of those to make my “8 of 9 on 7” cassette for the Isaac/Trek.

If a particular part becomes too rare it negates a lot of the value as a reliable tool. True victory over the technofascist bike industry is won by using durable but also replaceable parts to rejuvenate a simple bike indefinitely.