Thinking about returning from 1x to 2x

Discuss light weight issues concerning mountain bikes & parts.

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Wheely
Posts: 4
Joined: Mon Feb 27, 2017 11:32 pm

by Wheely

Recently bought a 2017 Scalpel Black Inc, was 2nd hand & the racer before me has removed the front Di2 derailleur and put a single oval 34 on the front (was 36/26). Thinking this may not be geared enough for me I replaced rear 11-40 with an 11-42

I raced it for first time this Sunday and although very pleased with bike and result I really struggled on the steep climbs, making speed and recovery after slower than I'd have liked.

Question is should I put it back to 36/26 and use the intelligence of a single shifter Di2 arrangement or should I try perhaps an oval 32 up front ??

I know as this is a weight saving forum the latter choice may seem obvious, but obviously some changes come at the expenses of others.

Many have made a 1x change, so what's the thoughts ??

grover
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Joined: Mon Jul 26, 2004 1:06 pm

by grover

There is an XT 11-46 cassette. Try that? It might give you the range you need?

The 11-46 cassette uses 2 aluminium cogs. The 11-40 and 11-42 use 1 aluminium cog. The 11-46 is lighter than the 11-42. This of course is comparing XT to XT. If you are using XTR cassettes you will be gaining weight to go to the 11-46 cassette.

Going a smaller chainring is an option, but you'll lose top end speed obviously. For XCO you're probably alright. But any sort of extended road eg. marathons and you'll be spinning out pretty soon.

I was in the same boat as you. 34 ring with 11-42 cassette. Wanted a little lower for climbing. Changed to a 32, but didn't like the lack of top end speed. So went 34 ring with 11-46 cassette which worked well for my fitness and terrain. I ended up with a 36 tooth actually. 36-46 is an easier climbing gear than 34-42 and it gets me a little more top end again. If a course is really steep I put the 34 back on.

Marin
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by Marin

OP, did you need the 11t cog? If not, you can go lower.

If your wheels can take an XD driver, you can go lower in the front and put on a SRAM 10-42 in the rear, which will give you 10% more top speed than an 11-4x cassette.

ritzelrechner.de <- play around with this too

AJS914
Posts: 2001
Joined: Tue Jan 28, 2014 6:52 pm

by AJS914

I don't get the attraction to 1X. I have 1X both on my mountain bike and on my gravel/cross bike and I wish both were 2X. (They both came with 1X and are expensive to put back to 2X so I can live with 1X.)

Wheely
Posts: 4
Joined: Mon Feb 27, 2017 11:32 pm

by Wheely

I didn't need the 11T on the last race, but some of my other training & rides I defo do need it. So perhaps 32T front I should rule out.

11-46 is a viable option I guess, and at around £75 its not bank-breaking.

And of course I have all the parts to convert back to original Di2 2x system (& only using right-hand shifter setup). Cost £0.

But adds weight and more to go wrong.........................

Well @ least we're down to options now!

ooo
Posts: 526
Joined: Sat May 21, 2016 12:59 pm

by ooo

with 1x you need to change front chainrings between courses

2x di2 is better for cadence/speed range, and electronic fd is not that bad (vs cable operated)
'

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LeDuke
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by LeDuke

ooo wrote:with 1x you need to change front chainrings between courses

2x di2 is better for cadence/speed range, and electronic fd is not that bad (vs cable operated)


I find 34x10-42 more than enough for any mountain bike course I've experienced. I've ridden that set up at over 3,000m/10,000ft in the Rockies, as well as in the relatively low but much more technical areas of the Appalachians in the eastern US.

KWalker
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Location: Bay Area

by KWalker

I ride a 34 with a 10-50 and before that 10-46. 6 feet 2 155-165lbs. Never felt limited by my ring setup on almost any course. I'd get the biggest cassette your group will fit, get fitter and lighter.
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02GF74
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Location: Sunny UK

by 02GF74

1x11 is a compromise; I have a 29er with 32T and 10-42. On very steep and long climbs I struggle and on the flat or down hill spin out. If I were younger, fitter and 10kg lighter, the climbing would not be such an issue.

Despite the limitations, I do like not having multiple chainrings.

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LeDuke
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by LeDuke

02GF74 wrote:1x11 is a compromise; I have a 29er with 32T and 10-42. On very steep and long climbs I struggle and on the flat or down hill spin out. If I were younger, fitter and 10kg lighter, the climbing would not be such an issue.

Despite the limitations, I do like not having multiple chainrings.

I have to ask:

How are you spinning out?

32x10 on 29x2.2s is 25mph.

That's going to take some doing, even on the road.

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TurboKoo
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Joined: Wed Oct 29, 2008 7:55 pm

by TurboKoo

I had last year also 2x/1x setup on my Pivot Mach 429SL. I ended up using 26/36 on hillier courses and 34 on flat courses. I had 40t in the back.

With Di2 I didn't need to think about FD and was super happy with both setups.
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mattr
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Location: The Grim North.

by mattr

LeDuke wrote:How are you spinning out?

32x10 on 29x2.2s is 25mph.
25mph at ~90rpm (you missed out the important bit)

and 25mph is (for me) probably half a dozen times a race (mostly marathons not XCO) last XCO race i hit 35 on the start straight, long smooth, slightly downhill and going for the hole shot (successfully i might add)

but then again, spinning out for me is nearer 140rpm (i can pedal faster, but not much point)

Personally i don't like 1x due to the ratio jumps, the range is there now, since the advent of the 11-46 and 10-50 cassettes.
But i'd probably need 15 or 16 steps to eliminate the jumps......

tonytourist
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by tonytourist

Eagle with a 36 :beerchug:

TheRookie
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Location: Midlands, United Kingdom

by TheRookie

mattr wrote:
LeDuke wrote:25mph at ~90rpm (you missed out the important bit)

and 25mph is (for me) probably half a dozen times a race (mostly marathons not XCO) last XCO race i hit 35 on the start straight, long smooth, slightly downhill and going for the hole shot

Hmm so if spinning out is over your 140rpm you can still hit that 35mph (just) with your gearing......
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mattr
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by mattr

More about LeDukes insistence that 25 is going "to take some doing". Not really. It's a fairly regular occurrence in XCO/M racing round here. It has been since my first forays into XC, 25 years ago.

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