Grumpier Mike,

What size of cassette do you use with your single ring and do you find that hills causes an issue with your performance?

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BoulderCyclingCoach.com

15 lbs

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"injustice anywhere is a threat to justice everywhere" MLK

Sweet setup! How'd you get it so light? The Cat Cheetah website quotes a typical build is 18lbs. (8,000 to 8,3000 grams per the website)

Rockdude, I'll chime in with my experiance running a 1x10 setup. I'm running a 44T WolfTooth Components wide/narrow chainring (for excellent chain retention) with a wide ratio 11x36 cassette (SRAM XX). This gives me the same climbing gear as a compact crank (50/34) and 11x28 cassette combo. The downside to my 44T and 11x36 combo is I give up some top speed beyond 34 mph and I loose the tighter gear spacing of a smaller cassette (I'll occasionally run a SRAM Red 11x28 cassette for flatter courses).

The wide ratio 10 speed SRAM XX 11x36 cassette works well on a course with lots of rolling hills as a single shift produces a noticeable change in gearing whereas a tighter cassette often requires 2 shifts to an easier gear to grab the gear needed on shorter punchy climbs and I'll repeat that that 44 x 36 creates a climbing ratio nearly the same as 34 x 28 so you can climb just about anything on the road.

In my estimation a great solution will be an 11 speed setup using a 44T front and a 10x36 cassette. This would give the climbing capability of a compact groupset and more than enough top-end.

FYI - I have a 1x11 SRAM XX1 groupset on my Mountain Bike (32T crank and 10x42 cassette) and its a thing of beauty - amazing shift performance and I've never dropped a chain! I'm really looking forward to SRAM's pending 1x11 Road Groupsets!!!!!

What about jumping to a 46 on the front. Might be a bit nicer and more like a 34/25.

It is a small frame, probably helps. Also, Di2 (only one) twist grip magura hydraulics, cat cranks (rediculously light), carbon chain rings, cat seat (70 grams), samson cassette (77 grams), zed tech wheels. Thanks for asking!

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"injustice anywhere is a threat to justice everywhere" MLK

I live in Bloomington, Indiana which is all hills and curves (very fun riding!). The hills are typically about 1/4 mile long with 200 to 300' elevation (many spots over 10% grade).

Given that I chose 44T for easier climbing. I studied the 46T very closely and if my terrain was a little flatter I would have chosen a 46T.

I often coast downhill around 45mph on the hills around Bloomington so downhill speed takes care of itself via gravity! (no need to pedal at 45+ mph!)

Losing the fd will save little to no weight if you go from red to force. (No red 1x11).
2 watts maybe, 6w for a fd seems very high.

I am using a 54 in front and I swap back and forth between 11-23, 11-25, and 11-27. I did a TT last week that had a big hill of roughly a mile length. I don't know the grade, by I went down it at 58.8 mph and back up around low teens at 330 watts. So let's say 6-7% max grade. I thought the 11-27 was just fine. Anything steeper or longer and I tend to ride a road bike with clip-ons and a 50/34 crankset.

One big reason for riding a single ring is that I find that I lose a lot of momentum if I have to drop from the big to small ring on a climb, so trying to accelerate to get back up to speed really kills me. I am better off relying on the read dérailleur to adjust cadence. Maybe a Di2 setup would make the shift quick enough, but I don't have that kind of cash.

On my Titanflex (pictured above in this thread) I dropped 207g or 0.46lbs going to single chainring. Here's the details:

+50g rear cassette from SRAM Red 11x28 to SRAM XX 11x36
+38g rear derailluer from SRAM Red to SRAM XX mid cage
-83g delete front Derailluer SRAM Red
-147g deleting SRAM RTC left shifter, cable and housing
-65g chainrings - delete SRAM Red 50/34 rings and replace with single 44T wide narrow WolfTooth ring

Note - My chain length stayed the same at 104 links so no savings there

2011 Trek SC 7, Size Large, Aeolus 5 ACC Wheels, SRAM Red, Zipp Vuka Aero Bar, 20.5 lb, not very light...

Hello sergio and All,

How is the Rotor Power Crank setup working?

I am thinking about those for my next bike ...................

Maybe start out with the one crank setup and add the other crank later.

.

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Cheers, Neal

+1 mph Faster

mine has been working well for 2 year

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S�rgio Marques
When it hurts is when it feels good ;-)
Sergio-Marques.com