Dbl chainring
- Thread starter M00se
- Start date
Mathew Fy
GRU
For long sustained climbs I can spin at 80 rpm going 5 mph with my S40. Stalling out in the 3-4 mph range, but trudging on as long as my stamina holds out. This is with a Long-Cage SRAM GX 2x11 (mountain bike derailleur, B-screw fully inserted), 10-42 cassette, and 34, 50 tooth chainrings.
Bent not broken!
Member
As I understand it, yes. If you want smaller chainrings and larger cassettes, you want MTB components..
I’m also considering switching to a 2x. I have a stock 2022 Q45. I could climb every hill on the hardest hilly route that I know. Did I want a few lower gears, yes. Did I NEED them, no. I suspect that it will become less and less of an issue, the more that I ride. I’m definitely getting stronger, learning new techniques and building my cardio. I will probably upgrade to 2x, if I ride steeper/longer hills or ride much dirt/gravel.
I’m also considering switching to a 2x. I have a stock 2022 Q45. I could climb every hill on the hardest hilly route that I know. Did I want a few lower gears, yes. Did I NEED them, no. I suspect that it will become less and less of an issue, the more that I ride. I’m definitely getting stronger, learning new techniques and building my cardio. I will probably upgrade to 2x, if I ride steeper/longer hills or ride much dirt/gravel.
Mathew Fy
GRU
You’re right about incompatibility. SRAM’s road bikes use “Exact Actuation” (Road 10 & 11sp, Mtn 10sp) is 3.1mm while X Actuation (Mtn 11sp) is 3.48mm.
On my S40 I have mountain bike shifters & brakes mounted to a Soma Gator handle bar. Ergon GP2 grips. It’s possible to use SRAM’s road brifters if you add a JTek Shiftmate 9 to get compatibility, but the shifting feels sloppy. I have no problems using the Force (road) front derailleur and road bike chainrings with the mountain bike shifter.
An alternative hack exists (but I can’t vouch for it):
The secret is the cable fin. That’s SRAM’s name for the small curved cable guide that directs the derailleur wire into the pinch bolt. That simple & replaceable part on all modern SRAM MTB & CX 1x rear derailleurs also happens to determines the cable pull, and swapping it can convert a regular X-Horizon Eagle MTB derailleur into an 1:1 Exact Actuation Eagle road pull derailleur.
How To: Hack a SRAM road group with Eagle derailleur for massive budget mullet gearing!
Don't miss this SRAM Eagle hack to convert your mechanical 1x gravel bike groupset into an affordable, wide-range gearing adventure setup for bikepacking!
bikerumor.com
Merczak73
Active Member
I have gone the SRAM AXS route with a double chainring setup. I have a 46/33 chainring up front and a 10-33 cassette in the back. Love it. I have yet to find a grade that I cannot climb. I really like the extra oomph on the downhills as I was spinning out, at times, with the stock 1x gearing.
Margo
Member
Here is what I consider the best solution: Schlumpf mountain drive (20/50) with 11(11-42) cassette:
(speed in km/h)
www.schlumpfdrive.com
I have not build this yet.
(speed in km/h)mountain drive - schlumpfdrive - ultraflat Planetary Gear for Bikes
www.schlumpfdrive.com
I have not build this yet.
Margo
Member
For comparison: (34/50) chainrings with 11x(11-42) casette. 80 rpm.
(speed in km/h)
(speed in km/h)Online Ritzelrechner / Übersetzungsrechner / Entfaltungsrechner für Kettenschaltungen
Der Ritzelrechner berechnet online die Übersetzung und die Entfaltung der Kettenschaltung eines Fahrrads
www.j-berkemeier.de
ratz
Wielder of the Rubber Mallet
What you'll find in the mountain drive if you build it; is the losses are huge in the hill gearing; to the point that the lowest 33% will feel really "spongy" which is why it never really caught on outside the trike community. I had the HS Drive and the Mountain drive on a Catrike 700 for quite awhile and while I could climb a wall with the mountain drive I avoided it like the plague because it I wound up pedaling squares. YMMVHere is what I consider the best solution: Schlumpf mountain drive (20/50) with 11(11-42) cassette:
View attachment 15802 (speed in km/h)
mountain drive - schlumpfdrive - ultraflat Planetary Gear for Bikes
I have not build this yet.
Margo
Member
Thanks, Bob, for this insight.
I was going to call Habestock today. But you are saying I would be happier with a double or tripple chain ring.
Right?
Too bad there is no 3 x 11 available.
Marc
ratz
Wielder of the Rubber Mallet
Yeah long term, the only schlumpf I was happy with was the highspeed drive that gave 1:1 in low and 2.5x1 in high, and in high, you didn't notice the losses.
Looking at your ratio's I think you'd get the most out of a 44 or 46 on the front and a 9x50 on the back..... Ditch the front derailleur all together. 44x50 is walking speed.
IF you wait until Saturday the build diary for the v20c should be getting to those discussions.
