What kind of reduction of CdA is possible by removing the inner chain ring?
Here in The Netherlands I don’t need the inner chain ring for my timetrials because all timetrials I do are flat. At this forum I see big improvements of CdA with small position changes and shape changes of material. Could removing the inner chain ring save a couple of watts?
2.) What about removing the last 3 cogs from the cassette? It’s a serious reduction in frontal surface. I have a shimano 11-23 cassette and can remove the last 3 cogs and I ride with a 53 x 11-18 setup.
What kind of reduction of CdA is possible by removing the inner chain ring?
Here in The Netherlands I don’t need the inner chain ring for my timetrials because all timetrials I do are flat. At this forum I see big improvements of CdA with small position changes and shape changes of material. Could removing the inner chain ring save a couple of watts?
2.) What about removing the last 3 cogs from the cassette? It’s a serious reduction in frontal surface. I have a shimano 11-23 cassette and can remove the last 3 cogs and I ride with a 53 x 11-18 setup.
Somebody has tested it?
If you take full advantage, reduce the Q by another cm or so with some track cranksets (175mm Record Pista are nice if you can find 'em) and a custom 110mm rear O.L.D. a la Walser, you’d be onto something.
Even a cut down block should help somewhat though… I love questions like this.
I will try these tweaks first. But keep your suggestions in mind. I have two shimano 10spd cranksets in a few days (one: 53/44 and the second: 53 total aero fibre lyte chainring) so I can swab the cranks easily between training and timetrials. I will keep the front derailleur in place for safety reasons. Do you know what kind of reductions are possible with only removing the inner chain ring and the 3 biggest cogs?
I will try these tweaks first. But keep your suggestions in mind. I have two shimano 10spd cranksets in a few days (one: 53/44 and the second: 53 total aero fibre lyte chainring) so I can swab the cranks easily between training and timetrials. I will keep the front derailleur in place for safety reasons. Do you know what kind of reductions are possible with only removing the inner chain ring and the 3 biggest cogs?
Nope, but I might be able to guess, let me dwell on the math for a bit.
I’m having trouble trying top work out how to approximate anything as generally I’d assume things to be a simple shape and do some basic calcs. In this case, I’m stuck as I would imagine that the geometry of stiffening webbing on the inside of the cranks and on the outside of the largest cog would significantly affect the conclusions.
Why not go fixed and remove the rear brake? That’d save drag!
