What are the big 3 waiting for to go sub-compact?

[bfd]

Originally Posted by Look585

While this is technically possible, it would be of spurious value, given cog #2 is a 12t in the 11-32, resulting is this gearing:

12,12,13,14,16,18,20,22,25,28,32



The 11-34 (and 11-40, if you can squeeze it in your system) works fabulously in this manner as cog #2 is a 13t.

Are Shimano 11 loose cogs available? if so, then maybe you can replace the 11t first cog with a 12t first cog and then add a 15t cog to give:

12-13-14-15-16-18-20-22-25-28-32

I believe this is the same gearing as the Campy Centaur 12-32 cassette.

Good Luck!

[NHAero]

You make an excellent point! Duh on my part.

Originally Posted by Look585

While this is technically possible, it would be of spurious value, given cog #2 is a 12t in the 11-32, resulting is this gearing:

12,12,13,14,16,18,20,22,25,28,32



The 11-34 (and 11-40, if you can squeeze it in your system) works fabulously in this manner as cog #2 is a 13t.

[NHAero]

SRAM Force22 carbon cranks, the ones with the removable spider. These came with the 110 BCD spider. I swapped with North Shore Billet 104/64 spider, and bought Shimano 40-28 XT chainrings (the outer had to be filed to fit on the spider, thanks Shimano). Wheels Mfg GXP BB.

Originally Posted by unterhausen

do you think you could post a couple of pictures of your setup?

[Mark McM]

Looks spiffy! That looks like a "standard" road front derailleur - does it shift the smaller chainrings okay? Looks like you were fortunate that the frame used a clamp on derailleur, so you could mount it lower than usual.

[AngryScientist]

excellent! thanks for the follow-up with this, well done!

[unterhausen]

Originally Posted by NHAero

SRAM Force22 carbon cranks, the ones with the removable spider. These came with the 110 BCD spider. I swapped with North Shore Billet 104/64 spider, and bought Shimano 40-28 XT chainrings (the outer had to be filed to fit on the spider, thanks Shimano). Wheels Mfg GXP BB.

That does look good. Thanks to you and especially to Mark McM, this is exactly the crank I have been looking for.


I have a Shimano CX70 fd on my gravel bike with a mountain 42-28 crank. It shifts fine.

[NHAero]

The front derailleur is a top pull CX70 10s. It looks as if it might shift an even smaller ring, so I have a 24T ring on order. If that works I'll put the 11-34 cassette on in place of the 11-40 to get tighter gear spacing. Then next move is to try the 11s front STI shifter to see if I can set it up with the CX70 and avoid chain rubbing.

Mark, this is a great hack, and the bike is coming together. Thanks for all of your terrific information and generosity in walking us through it.

Also, the crank has almost as low of a Q factor as can clear these stays.

Finally - the clamp on fd is key - I just couldn’t get this setup to shift on the anderson because of the braze-on tab even with the adapter that lowers the fd. It wants to be in-between.

Originally Posted by Mark McM

Looks spiffy! That looks like a "standard" road front derailleur - does it shift the smaller chainrings okay? Looks like you were fortunate that the frame used a clamp on derailleur, so you could mount it lower than usual.