Crankset-gearing dilemma

Discuss light weight issues concerning road bikes & parts.
Amazinmets87
Posts: 10
Joined: Sat Sep 29, 2018 10:38 pm

by Amazinmets87

I'm building a bike on a strict budget and am stuck between 2 cranksets. One is a Centaur compact 10-speed crankset for $70 while the other is a Potenza standard 53-39 for $80. Given that the bike will otherwise be equipped with Potenza components this seems like a no-brainer. However, I would strongly prefer a compact crankset due to its exponentially more practical gearing.

Here are my questions:

I believe Potenza gives the option to run larger cassettes, up to a 32. Will running a 32 tooth cassette on a standard crankset provide the same functionality as a compact?

If I opt for the Centaur crankset will I have compatibility issues with a 10-speed crank on an 11-speed drivetrain?

by Weenie


alcatraz
Posts: 1344
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

Is the centaur compatible and are you ok with it's perfomance?

If yes then it just sounds like a severe case of ocd to choose looks over function. :D

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themidge
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Location: yer ma

by themidge

Standard crank = 32 cassette for easy enough gears = gappy gear ratios
Compact crank = 25/28 cassette for the same easy gears = less gappy ratios

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silvalis
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Location: Aus

by silvalis

Amazinmets87 wrote:
Tue Oct 09, 2018 6:54 am

If I opt for the Centaur crankset will I have compatibility issues with a 10-speed crank on an 11-speed drivetrain?
No, just make sure you've got an 11s chain. I ran a 10s Centaur UT crank with an 11s drivetrain for a while. Worked. Shifting was pretty average.
Chasse patate

AJS914
Posts: 2479
Joined: Tue Jan 28, 2014 6:52 pm

by AJS914

Why start off with a 10 speed crankset and have a mis-matched system and less than perfect shifting?

I'd only do that if you already have the 10 speed crankset.

Amazinmets87
Posts: 10
Joined: Sat Sep 29, 2018 10:38 pm

by Amazinmets87

AJS914 wrote:
Tue Oct 09, 2018 4:18 pm
Why start off with a 10 speed crankset and have a mis-matched system and less than perfect shifting?

I'd only do that if you already have the 10 speed crankset.
I've already explained why...

AJS914
Posts: 2479
Joined: Tue Jan 28, 2014 6:52 pm

by AJS914

I re-read your first post and still don't see the reason. Price alone? I wouldn't choose the wrong gearing because the price is right.

FWIW, 1st generation Potenza cranks are Power Torque. The current ones are Ultra Torque. Ultra Torque is much easier to service and doesn't require an expensive tool.

joeyb1000
Posts: 135
Joined: Thu Mar 03, 2016 8:37 pm

by joeyb1000

Amazinmets87 wrote:
Tue Oct 09, 2018 6:54 am

I believe Potenza gives the option to run larger cassettes, up to a 32. Will running a 32 tooth cassette on a standard crankset provide the same functionality as a compact?

If I opt for the Centaur crankset will I have compatibility issues with a 10-speed crank on an 11-speed drivetrain?
1. Yes, can run 32 on both. Personaly, I like the shifting on the std crankset better than the compact.
2. As stated, no compatability problems. Just need 11s chain.

My opinion: if the Centuar has old PowerTorque, then NO. If Centuar UltraTorque, the choice is yours.

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Miller
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Location: Reading, UK

by Miller

UT is nicer to deal with than PT, certainly, but it's worth noting that there was a PT v2 where the LH crank has a self-extracting nut, so no need for a bearing puller if you want to remove the chainset. Think that was for just one model year, 2016 maybe, as Campag has since gone to UT for Potenza. PT chainsets also come out as being quite light in weight.

Ideally the OP would aim for a Potenza compact crank but I'm guessing that would put a dent in the budget. I'm sure the Centaur 10sp would work fine in the drivetrain although the front shifting might not be as delightfully slick as current gen Potenza offers.

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IrrelevantD
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Joined: Sun Nov 29, 2015 5:47 pm
Location: Near DFW Airport

by IrrelevantD

Amazinmets87 wrote:
Tue Oct 09, 2018 6:54 am
I'm building a bike on a strict budget and am stuck between 2 cranksets. One is a Centaur compact 10-speed crankset for $70 while the other is a Potenza standard 53-39 for $80. Given that the bike will otherwise be equipped with Potenza components this seems like a no-brainer. However, I would strongly prefer a compact crankset due to its exponentially more practical gearing.

Here are my questions:

I believe Potenza gives the option to run larger cassettes, up to a 32. Will running a 32 tooth cassette on a standard crankset provide the same functionality as a compact?

If I opt for the Centaur crankset will I have compatibility issues with a 10-speed crank on an 11-speed drivetrain?
Speaking strictly on gear ratios... a 39/32 (1.22:1) is going to be about the same as a 36/30 (1.20) or a 34/28 (1.21). In my opinion, it really boils down to where you live and how you ride.

http://www.bikecalc.com/gear_ratios is an ok site if you want to sort out how different combinations will compare.

Personally, I live in North Texas where it's really hard to find any hills over 10% for more than 150 meters or so and extremly rare to find anything over 16-18%. I can handle just about anything out here with a 39/28, so I run a standard 53/39 front because I like having the big gear on the flats and shallow descents. I've run mid-compact (50/36 and later 52/36) and found that I would sometimes go entire rides without touching the small ring.

The other thing is how do you feel about the bigger jumps in the 11-32 cassette? Personally, I like the smaller jumps of the 11-28. I have an 11-32 on my CX bike, and it's tolerable there because when I get down into the big end of the cassette, I'm off road and need to be there. I spend more time in the small ring and 13-19 cogs and not so much in the big ring where the jumps are more noticable. I know I wouldn't like the bigger gaps on the road though.

Personally, I would look at which will better suit where and how you ride and base your decision on that.
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I'll leave it up to you to figure out the other 30%. If you are in any way offended, that's on you.

ooo
Posts: 650
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by ooo

Amazinmets87 wrote:
Tue Oct 09, 2018 6:54 am
I believe Potenza gives the option to run larger cassettes, up to a 32. Will running a 32 tooth cassette on a standard crankset provide the same functionality as a compact?
Campagnolo offers 11-32 and 12-32 cassettes:

11-12-13-14-15-17-19-22-25-28-32
12-13-14-15-16-17-19-22-25-28-32

12-32 have the similar gaps to 11-29
'

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WMW
in the industry
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by WMW

Amazinmets87 wrote:
Tue Oct 09, 2018 6:54 am
However, I would strongly prefer a compact crankset due to its exponentially more practical gearing.
Not really. The 34-50 or 36-52 jump is too big IMO.

A 39/32 ratio is the same as a 34/28.
formerly rruff...

RussellS
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Joined: Wed Feb 03, 2010 1:31 am

by RussellS

WMW wrote:
Sat Oct 13, 2018 2:19 am
Amazinmets87 wrote:
Tue Oct 09, 2018 6:54 am
However, I would strongly prefer a compact crankset due to its exponentially more practical gearing.
Not really. The 34-50 or 36-52 jump is too big IMO.
Agree. The HUGE 16 tooth jump between rings with a 50-34 crank makes it terrible if you ever have to change rings. Most of my cranks use 53-42 or 52-42 rings. Smooth pleasant change between rings. No shifting five cogs in back to get to the right gear. Just shift one or two cogs and you are in the perfect gear. I hate 53-39 cranks too. Too big of a jump between rings. Too much shifting in back to get to the right gear.

2lo8
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by 2lo8

That's why triples are king.
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CarlosFerreiro
Posts: 319
Joined: Thu Jan 08, 2009 1:41 pm
Location: Shetland, Scotland

by CarlosFerreiro

Is the true joy of Campag not the matching action on left and right shifters to change the front ring either way and still stay in the same ratio? :lol:

by Weenie


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