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Reconfiguring Roubaix 3x8 to 2x11 - help?

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Reconfiguring Roubaix 3x8 to 2x11 - help?

Old 07-11-20, 05:18 PM
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Danhedonia
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Reconfiguring Roubaix 3x8 to 2x11 - help?

Bought a Specialized Roubaix 105 to be a dedicated Zwift-cycle. It has a 3x8 config, and after a test ride (40 miles) I decided that I vastly prefer 2x11, and want the bike to have that format. I ride 6-10 hours/week.

I do have a local mechanic, and am willing to purchase necessary parts.
Already have:
11-speed cluster (Ultegra 11-28t)
FSA crankset, although I like the one on the bike OK. Comes w/48/34 front rings ... I generally prefer 53/39, but willing to start with these.

I have a few questions, any info gratefully received.

1. Always the first question - is this a dumb idea? Is converting a 3x8 to 2x11 bad juju?

2. Other than 11 speed shifters, what else will I need?

My goal is to have a 2x11 that sits on the trainer - I have a Giant that is my regular outdoor ride.
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Old 07-11-20, 05:36 PM
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You will need a new rear wheel as 8/9/10-speed freehub bodies won't accept an 11-speed cassette. You will also need a new rear derailleur as 11 speed derailleurs have different geometry from 10-speed and prior ones.

Going 2x10 would be a lot cheaper as a 10-speed cassette work with your current rear wheel and 10-speed shifters will work with your current rear derailleur.

In either event you will need a new 10 or 11-speed chain.
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Old 07-12-20, 01:21 AM
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I'd keep the triple and go 3X9.
You have a much wider assortment of cog combinations over 8.
Do you really need an 11T cog or is it just a wasted gear?
To me, 3 ranges of more closely spaced gears trumps 2 ranges of more widely spaced gears.
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Old 07-12-20, 07:36 AM
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Danhedonia
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Thanks for the replies. I don't know what I need, because I'm not very experienced with all of this. I am a formerly athletic 54 year old recovering from a seizure. I average 18-19mph over 30 miles on my daily rides, and top speeds go up to about 30 according to Strava and MapMyRide (I run both simultaneously). I am not 'into' bike culture as much as I simply love being on a bicycle and need to ride to recover fitness, lose weight, and feel the joy of riding.

I mention that because when I'm on my 2x11, I find myself going through all of the gears (yes, the 11 gets use), with the exception of the 30 unless I have a tough climb. When I did the test ride of the Roubaix, there was just zero need for the third/small front ring, and I found myself not using the bigger gears in the back at ALL. I guess I'm a masher, not a spinner (and that's not likely to change, I'm riding 100-140 miles a week now and don't see that ever increasing just because of time).

So TLDR is: I use all my 22 gears on the Giant, but only used about 12-14 gears on the Roubaix. It felt weird and wasteful, and I didn't like where the gears were vs. my natural pedaling cadence.

Was that too long? Probably.

Given that the bike is supposed to go directly onto a Kickr Core, I don't think I'll need a rear wheel. This bike won't have a rear wheel at all? Am I missing something?
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Old 07-12-20, 08:42 AM
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Originally Posted by Danhedonia View Post

Given that the bike is supposed to go directly onto a Kickr Core, I don't think I'll need a rear wheel. This bike won't have a rear wheel at all? Am I missing something?
This information about the trainer was missing from earlier questions hence the advice about needing a new wheel. You will need shifters, derailleurs, chain and crankset
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Old 07-12-20, 03:22 PM
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Danhedonia
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My bad - I thought 'dedicated Zwift cycle' implied it.

Either way, I'm wondering if bike frames 'prefer' certain configurations? I know nothing about bike design, but I'm good with guitars, and certain guitars 'seek' certain configurations. I just hope I don't wind up putting lipstick on a pig.
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