Lighter crankset option than my DA 9100?

Discuss light weight issues concerning road bikes & parts.
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Noctiluxx
Posts: 308
Joined: Tue Feb 07, 2017 7:17 pm
Location: Southern California

by Noctiluxx

I'm looking to upgrade my DA 9100 (52-36/170mm) crankset to something lighter, stiffer, and asthetically nicer. I'm aware of THM Clavicula SE cranks, and not much else. My bike is an Oltre XR4. Thanks!
2018 Bianchi Oltre XR4, (Celeste Matt)
2018 De Rosa SK Pininfarina (Blu)
2017 Giant TCR Advanced SL (Red)
2016 Specialized Allez DSW Sprint (Gold)
2016 Giant Anthem Advanced SX (FS)
2018 Trek Farley EX 9.8 Fatty (FS)

by Weenie


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Lelandjt
Posts: 421
Joined: Tue Jan 19, 2016 7:10 am

by Lelandjt

Sram Red are the cheapest light cranks, especially if you have a BB30 or PF30 frame. Claviculas are the ultimate if budget allows. Lightnings fall in between and if you have a PF30 frame you can sometimes find the Specialized version of Lightnings for fairly cheap on ebay.

I don't think there's anything out there significantly stiffer than 9100, just lighter.

alcatraz
Posts: 972
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

If you have a pf86 frame it's likely you have a 41id bb shell. This means you will be stuck with heavier 22-24mm axle cranks like shimano hollowtech and sram gxp.

Going with sram gxp or maybe fsa kforce/slk (swap chainrings) would be a little lighter than r9100. But not by much. I'd say keep the r9100. It's already hard to improve on @640gr.

/a

Mostlyharmless
Posts: 1
Joined: Fri Apr 13, 2018 2:12 am

by Mostlyharmless

basically every crank is lighter than Dura Ace

eric01
Posts: 530
Joined: Mon Feb 06, 2006 1:06 am

by eric01

Easton carbon or the rotor huez?
AX Lightness Vial Evo, Carl Strong Titanium

kode54
Posts: 1212
Joined: Tue May 23, 2006 9:39 pm

by kode54

big difference between those two. and depends on your budget.
Noctiluxx wrote:
Sun Jun 24, 2018 4:22 am
I'm looking to upgrade my DA 9100 (52-36/170mm) crankset to something lighter, stiffer, and asthetically nicer. I'm aware of THM Clavicula SE cranks, and not much else. My bike is an Oltre XR4. Thanks!
- AX Lightness Vial EVO D + DA9150 + Enve SES 3.4 carbon hubs
- Parlee Altum + DA9150 + Enve SES 4.5 carbon hubs
- Parlee ESX + DA9150 + THM SRM PM + Enve SES 6.7 CK hubs
- Independent Fabrication Ti FLW + DA9100 + Enve 3.4 CK hubs

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madcow
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by madcow

alcatraz wrote:
Sun Jun 24, 2018 6:17 am
If you have a pf86 frame it's likely you have a 41id bb shell. This means you will be stuck with heavier 22-24mm axle cranks like shimano hollowtech and sram gxp.
Just for the sake of clarity that isn't correct, with BB86 there really isn't a problem using a crank with 30mm spindle. Thm, Lightning, Easton, Praxis etc... all make bb86 bottom brackets for their cranks. The limits of spindle size become a problem when you go down to bb90. It's possible to fit a 30mm spindle into a bb90, but the bearings in that case are so small that they don't hold up well.

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

by alcatraz

30mm crank in a 41id shell would leave 5.5mm for the bearing AND cup. That is not a large ball spinning around in there. I'd avoid it myself...

If the bearing were super high quality and the rider light as a feather it might work ok.

/a

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madcow
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by madcow

alcatraz wrote:
Wed Jun 27, 2018 3:29 pm
30mm crank in a 41id shell would leave 5.5mm for the bearing AND cup. That is not a large ball spinning around in there. I'd avoid it myself...

If the bearing were super high quality and the rider light as a feather it might work ok.

/a
Most of the bb86 for 30mm, or 4130 bb's as some like to call them don't have a separate bearing and cup. Most are now being made with a lip so that the outer race of the bearing is the cup. This leaves enough room for a decent sized bearing. Thm and others have been making them this way for years and we've never really seen any issues with them.

by Weenie


Hexsense
Posts: 462
Joined: Wed Dec 30, 2015 12:41 am

by Hexsense

yeah,
let see, BB86 use 41mm outer and 37mm inner cup and bearing with 37mm outer 24mm inner.
Their bearing is also (37-24)/2 = 6.5mm
Actually, most bearing are not even have 24mm inner but rather a standard size 6805 bearing which has 25mm inner. pair with 1mm hat to make it 24mm. So more like 6mm for the bearing.

Not much bigger than a direct fit 4130 bearings without cup (5.5mm)

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