On Bicycles, and.... what else is there?

Last time I analyzed some data from DC Rainmaker, probably riding around Paris, where I was surprised to find that he would have experienced less lateral chain deflection on a 1×11 set-up with a 44-chainring and an 11-25 cassette than he did with a compact 2×11 setup with 34-50 in the front and 11-25 in the back. This is because the 34-50 is a relatively wide chainring range, and one ends up having to chose between cross-chained options on the front: big ring with large cog os small ring with small cog, neither of which is a good choice, just to hit the mid-range of gears. Meanwhile the 1×11 is optimized for the mid-range. But what about rides with extreme terrain, climbing and descending? Here mid-range may be hardly used, spending most of the ride either in low climbing gears are large descending gears. Fortunately the second example I found, this time on the Di2Stats sample page , was highly representative. It's epic: a 60 mile ride with 9600 feet of climbing and descendin...

There's been an almost religious response to SRAM releasing 1×11 for the road. I find this puzzling, as to me it represents a valid choice for riding where super-wide range gearing isn't needed. And in the vast majority of the United States, the idea regularly riding extended steep climbs is at best a fantasy. It's restricted to European bike tours, etc. 1×11 provides basically the same gear spacing as 2×8, which honestly back in the day was fine, although also not for everyone, and those who wanted more went to triple chainrings. Today a lot of those who used triples back then are fine with wide-range 2×10 and 2×11 options. But if you want to avoid dealing with a front shifter, and maybe save a bit of weight, 1×11 can be an attractive choice. I was riding with an old colleague from Stanford Cycling, Mark, who's been riding SRAM 1×11 on hilly San Francisco Bay area rides and he loves it. But then he started racing with 2×6, and so learned to ride at a somewhat w...

It's just been reported SRAM is coming out with a 1×11 road system . This is hardly unexpected: they've already done this for mountain bikes and cyclocross. Single chainring road? Are you crazy? Hardly. First, I have several friends who like riding around the San Francisco Bay area on not just single front, but single rear as well. Fine-tuned gear ratios are somewhat over-rated. But in a race situation, this wouldn't do. Only 11 cogs? That compares to, for example, 20 gears on a 2×10, right? The jumps will be almost twice as big (10 gaps compared to 19). But this isn't how it works. On a front derailleur system, you tend to shift the front, select gears from the option for that chainring. You only shift the front to shift the range of available gears, not to fine-tune a gear. Using the front to fine-tune a gear ratio used to happen, way back when when people ran 5 or 6 tooth cogs in the rear, and then mostly for bike touring where taking the time for a...