1x11 gearing on a bent

DIscuss anything relating to non-standard cycles and their equipment.
UpWrong
Posts: 879
Joined: 31 May 2009, 12:16pm
Location: Portsmouth, Hampshire

Re: 1x11 gearing on a bent

Postby UpWrong » 6 Jul 2019, 6:03pm

Still no cassette, but this looks good if I can make a customised 13-40T cassette:
http://ritzelrechner.de/?GR=DERS&KB=33, ... H&DV=teeth

UpWrong
Posts: 879
Joined: 31 May 2009, 12:16pm
Location: Portsmouth, Hampshire

Re: 1x11 gearing on a bent

Postby UpWrong » 7 Jul 2019, 3:21am

In the name of science, I have ordered a Goatlink and a 40T expander sprocket :lol:

speedy7777
Posts: 16
Joined: 24 Sep 2017, 11:20pm

Re: 1x11 gearing on a bent

Postby speedy7777 » 24 Jul 2019, 10:16pm

You probably went the right way with the double. My recumbent bike is set up with 44t single front ring and 11-40 - 10 speed cassette. After about a thousand K im finding id like a little more top speed (currently spinning franticaly to hit 60kmh) eg 48t or 50t. It would also be a better road bike if the gears had smaller gaps between them. But the simplicity of 1x is quite nice nice too. So a double would have suited me well and i might try it one day with a 11 -32 cassette but in the mean time maybe try a 46 tooth front ring.

UpWrong
Posts: 879
Joined: 31 May 2009, 12:16pm
Location: Portsmouth, Hampshire

Re: 1x11 gearing on a bent

Postby UpWrong » 30 Jul 2019, 4:27am

I've been riding my RANS Stratus XP with its 3x9 and it's given me pause for thought. The triple on that is so easy and nice to use - it has SRAM X9 with its 1:1 actuation ratio. I believe the exact ratio is 1.1 to 1. My Paseo currently has a 2x9 using Deore RD, actuation ratio is 1.7 to 1. It's performance has deteriorated with use. (See https://www.artscyclery.com/science-behind-the-magic/science-behind-the-magic-drivetrain-compatibility/)The triple on the RANS is a 28-38-48 Spa chainset with Sora FD. Ring changes are easy and smooth with the 10T gaps.

So I either change my Paseo to 2x10 with XT-Dynasys (actuation ratio 1.2 to 1) or re-instate the 3x9 with SRAM X9. The double solution will use a 33-48 compact double. I'm wondering how slick or not the 15T change will be.

UpWrong
Posts: 879
Joined: 31 May 2009, 12:16pm
Location: Portsmouth, Hampshire

Re: 1x11 gearing on a bent

Postby UpWrong » 29 Dec 2019, 4:06pm

I have made up a 13-40T 10 speed cassette with XT RD mounted on a Wolf tooth goat link and XT shifter. Cabling and gear adjustment was very easy.
IMG_20191229_123539.jpg
IMG_20191229_150408.jpg
IMG_20191229_150717.jpg

UpWrong
Posts: 879
Joined: 31 May 2009, 12:16pm
Location: Portsmouth, Hampshire

Re: 1x11 gearing on a bent

Postby UpWrong » 12 Jan 2020, 6:28pm

So got to do a test ride with the new configuration today. It felt strange to be back on it after 6 months of using other bikes. It will take me a while to get my confidence back. Have to says it's an easy machine to balance though. It's amazing how you can set things up on a stand but still need to make adjustments whilst on the road. I over-ran the bottom sprocket and had to screw the limit screw in a bit more. As a reminder this is the gearing,
http://ritzelrechner.de/?GR=DERS&KB=33,48&RZ=13,15,17,19,22,25,28,32,36,40&UF=1990&TF=80&SL=3.5&UN=MPH&DV=teeth

I seemed to be ok starting in bottom on the big ring. I will probably change the FD to an SRAM X5 double, which should make the pull onto the big ring easier. I will then have to weigh it if this really is my final config.

UpWrong
Posts: 879
Joined: 31 May 2009, 12:16pm
Location: Portsmouth, Hampshire

Re: 1x11 gearing on a bent

Postby UpWrong » 8 Feb 2020, 6:07pm

I have done some further rides and the 2x10 gearing is working out. I kept the SORA FD double operated by Deore LH triple shifter. I just had to rotate the shifter to make it easier. The XT RD and XT Dynsys shifter are a delight. A big improvement over the 9 speed Alivio. I removed a chain link to eliminate a small amout of chain wrap and all 20 gears are perfectly usable. With the 33/48 double and 13-40 cassette the RD is having to cope with 42T difference which is well within spec. The step up and down at the front (around 45% change up) is slick enough not to cause me grief.

So I just need to do a final weighing.