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Advice on cassette/crank combo (48/32 crank)

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Advice on cassette/crank combo (48/32 crank)

Old 03-14-17, 03:08 PM
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mjrLV
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Advice on cassette/crank combo (48/32 crank)

I'll be picking up a Lynskey R265 frameset and trying to figure out the proper gearing.

Currently, I have a CF endurance bike with an Ultegra Groupset (50/34 and 11-32)

The gearing is just about perfect for where and how I ride. The ONLY thing I really want is tighter gearing on the rear. The gaps are just to pronounced for me.

Can I go with smaller cranks in the front, then a 'tighter' cassette in the rear? Also, looking at the gear calculator, doesn't seem like I'm losing much over the two configurations below.

http://www.ritzelrechner.de/?GR=DERS...28,32&UF2=2150

Here are the options I was thinking of:

Ultegra Di2 - Praxis 48/32 crank : Shimano 11-28 cassette
SRAM eTap - Praxis 48/32 crank : SRAM 11-28 cassette

Anything else I should consider or missing here?

Thanks for any suggestions!

Last edited by mjrLV; 03-14-17 at 06:06 PM.
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Old 03-14-17, 03:19 PM
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Praxis Alba is compatible with Di2 (I checked) and I would imagine with eTap (I did not check).
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Old 03-15-17, 08:32 AM
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The 48-32/11-28 is indeed an improvement, but do you really need a 48/11 high? If it were mine, I would go 13-28, something like:
13-14-15-16-17-18-20-22-25-28
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Old 03-15-17, 07:49 PM
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Originally Posted by mjrLV View Post
... The gearing is just about perfect for where and how I ride. The ONLY thing I really want is tighter gearing on the rear. The gaps are just to pronounced for me.

Can I go with smaller cranks in the front, then a 'tighter' cassette in the rear? ....Here are the options I was thinking of:
Ultegra Di2 - Praxis 48/32 crank : Shimano 11-28 cassette
SRAM eTap - Praxis 48/32 crank : SRAM 11-28 cassette

Anything else I should consider or missing here? ...
You are aware of the separate thread on 46/30 front cranks - there are some relevant posts (especially re using Praxis crank with Di2)

I can relate to the desire for a smaller front crank. In my case (new Ti bike to celebrate my 70th birthday) I am choosing to go with 46/30 front crank:
~ last year I was looking for a lower gear on the steepest climbs to keep my heart rate within ranges that do not make my heart specialist too uncomfortable);
~ if my first use of indoor training this winter has in fact improved my strength, in the short term I can use a tighter block at the rear;
~ I went with the best Sugino crank - not inexpensive, (but beautifully packed complete with small bar of KitKat + a piece of origami!!) and people I trust advise me it works well with Di2 (and presumably SRAM as well);

My 2c as to what you could consider:
~ a change to 48/32 is not very significant, and an 11/28 cassette gives you a more challenging ratio for hill climbs (32/28 vs current 34/32)
~ why not consider a 46/30? (Personally, I am not worried about the reduction in my 'high' gear - spinning at a 90/100 cadence gets me more than fast enough using the small 11 cog).
(i) Using an 11/28 cassette will leaves the low gear (30/28) about unchanged from previous 34/32
(ii) You could consider moving to a really quite tight 11/25 cassette, giving a low gear (30/25) not that different from your proposed (32/28)
(iii) Depending on your cadence / speed requirements, you could even consider a really tight 12/25 cassette

Enjoy your new bike - do not sweat too much on the rear cassette as they can be easily changed. The front crank size seems to be the more important decision IMHO
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Old 03-16-17, 08:28 PM
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Originally Posted by FamilyMan007 View Post
You are aware of the separate thread on 46/30 front cranks - there are some relevant posts (especially re using Praxis crank with Di2)

I can relate to the desire for a smaller front crank. In my case (new Ti bike to celebrate my 70th birthday) I am choosing to go with 46/30 front crank:
~ last year I was looking for a lower gear on the steepest climbs to keep my heart rate within ranges that do not make my heart specialist too uncomfortable);
~ if my first use of indoor training this winter has in fact improved my strength, in the short term I can use a tighter block at the rear;
~ I went with the best Sugino crank - not inexpensive, (but beautifully packed complete with small bar of KitKat + a piece of origami!!) and people I trust advise me it works well with Di2 (and presumably SRAM as well);

My 2c as to what you could consider:
~ a change to 48/32 is not very significant, and an 11/28 cassette gives you a more challenging ratio for hill climbs (32/28 vs current 34/32)
~ why not consider a 46/30? (Personally, I am not worried about the reduction in my 'high' gear - spinning at a 90/100 cadence gets me more than fast enough using the small 11 cog).
(i) Using an 11/28 cassette will leaves the low gear (30/28) about unchanged from previous 34/32
(ii) You could consider moving to a really quite tight 11/25 cassette, giving a low gear (30/25) not that different from your proposed (32/28)
(iii) Depending on your cadence / speed requirements, you could even consider a really tight 12/25 cassette

Enjoy your new bike - do not sweat too much on the rear cassette as they can be easily changed. The front crank size seems to be the more important decision IMHO
I just re-read the '46/30 thread.' Seems like Di2 is a NO go with the Praxis cranks.

Going to check out possible 46/30 options now.

Thanks!
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Old 03-16-17, 09:41 PM
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I settled on White Industries 46/30T front with an 11-32T cassette. Works quite smoothly with Di2 (certainly much more smoothly than my worn Ultegra 50/34T crank). I had the advantage of having a clamp-on front derailleur mount, so it could make the adjustment.
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