Aethos Sub6kg in " a-not-dwarf-size" 58 cm

[liam7020]

Oops, see it now on pg2 + stunning!

[Jbopp76]

First of all; I dont mean to insult small people with the title;
I live in Holland and we tend to be quite tall people. In our shop the most sold sizes are 56, 58 and 60/61. Most of the really weenie builds are always sz 49, 52 and maybe a 54. Not for me sadly..

I set out quite some time ago to build a sub 6.8 kg bike based on a Lightweight Urgestalt frame and started collecting parts.
In the end i had it all ready to assemble, and quite some changes came in a short notice. First of all those changes was becoming the new owner of my LBS.
Its quite the thing to combine your passion with your day-job and it pleases me every minute of the day that I made this change. We are a Specialized dealer and through this forum I saw Spesh was busy with some stuff before our sales-rep told us anything (so good to be here!).
That "new thing" was the Aethos and before I knew it I placed the order for a carbon-jet-fuel frame in size 58. I have carefully weighed all parts and even went crazy with some things like weighing tyhe complete stock of 23mm GP5000 tires to find the two lightest ones.

The goals for this build we're very clear;
- As light as possible but with a few remarks
- Daily usable tires hence the choice for GP5000
- Powermeter included
- Shimano based pedals as I dont want to have a pair of shoes stricyly for this bike
- No crazy un-usable parts - should be possible to use daily.

It came out with the following list:
Frameset: 641 grams - Aethos sz 58 Carbon jet-fuel
Fork: 286 grams - Aethos
Spacer: 3 grams - Aethos Carbon UD
Headset bearings and ring: 44 grams - Aethos
Frame hardware and plastics: 27 grams - Aethos
Expander kit: 15 grams - Schmolke TLO
Thru Axles: 49 grams - Specialized
Seat Binder: 4 grams - Darimo Sub 4
Seatpost: 83 grams - Darimo T1 UD
Stem: 73 grams - Darimo IX2 in 120mm
Handlebar: 146 grams - Darimo Ellipse UD in 44cm
Saddle: 71 grams - Berk Dila (TO BE SWAPPED WITH LIGHTER SADDLE)
Garmin Mount: 16 grams - Carbonworks
Bottle Cages: 22 grams - Alpitude Superleggero (TO BE SWAPPED WITH CARBONWORKS)
Wheel front: 514 grams - Extralite C38
Wheel rear: 569 grams - Extralite C38
Tyres: 396 grams - Continental GP5000 in 23mm
Tubes: 45 grams - Tubolito S-Road
Rim Tape: 13 grams - Tune
Brake Discs + Bolts: 146 grams - Ashima in 160 front and 140 rear
Cassette: 139 grams - Rotor Uno 11-28
Bottom Bracket: 86 grams - C-Bear Ceramic BSA-30mm
Front mech: 163 grams - SRAM eTap 11 speed
Rear mech: 230 grams - SRAM eTap 11 speed with C-Bear Carbon jockey wheels
Shifters/cables/calipers with bolts: 744 grams - SRAM eTap 11 speed (BRAKE PADS TO BE SWAPPED WITH LIGHTER ONES)
Crankset: 537 grams - SRAM Red BB30 with Quarq AXS Power Meter
Chainrings incl Bolts: 167 grams - Rotor Carbon 50-34
Chain: 210 grams: PYC SP11
Pedals: 234 grams - Shimano Dura Ace
Bar Tape: 45 grams - Lizard Skins DSP 1.8

Grand total: 5717 grams

I want to improve on the brake pads (alloy backing plate), saddle (maybe Gelu?) and swap the bottle cages for CarbonWorks too. Should come in at something like 5670 grams in the end I figure.

If anyone has some ideas to shed more weight - please shout! Yes - I already watched the THM crankset but as all my bikes are built with Red eTap 11 Speed I like to continu the theme..



The Q Rings have been installed correctly in the meantime

Hi , Do you still have the Aethos ? Are or were you happy with it ? I'm looking to buy a 58cm as well My saddle height 80cm . I live in Mallorca where it is super hilly. Any thoughts

[c50jim]

No answer from the original poster to your question. I'm not sure whether you were asking about this specific bike or the Aethos in general. When the Aethos was announced in late 2020, I decided this was the bike for me. I love my C40 but it's sort of old technology and I'd been watching for something new where aero wasn't the prmiary goal of the builders. I bought a 58 cm SWorks with Red and have ridden it for three years. Not sure how many km because I have several bikes but I ride >12,000 km/annum and my primary good weather bike is the SWorks Aethos so it probably has something like 15,000 km on it.

I liked it so much that I ordered a second one to take to my place in the mountains. I got under the covid wire with the first one but waited something like 18 months for the second. Not SWorks, just the one level down with Force instead of Red. Frankly, I really don't notice the extra weight. This one has only been ridden something like 1,000 km because we didn't get out to the mountains much this year because of health problems.

My saddle height is 79.3 cm and I switched to a 12 cm stem and 42 cm bars. Fit works well for me. Bike climbs discernably better than my C40s. Ride is almost as good and I have no fear of handling at speeds up to 75-80 km/hr which I can reach on some hills. I'm old (73 next week) so my power level has fallen to the extent that I'm not a good judge of reaction to power. No problem with my feeble legs.

[poulhansen]

Do you know the maker of "Headset bearings and ring: 44 grams - Aethos"?

Tesa tape = 14 g
Remove the rubbercovers -40 g
DA 34T & Extralite 50T = 39 g + 67 g

[OtterSpace]

Do you know the maker of "Headset bearings and ring: 44 grams - Aethos"?

The specialized part number is for the headset is: S202500012

The top bearing looks like a hybrid Tange Seiki going off the color in S202500012 photos which matches the color of the bearings in my SL6 which from personal experience I know are Tange Seiki.

Edit: Found more info here. I was correct about the top bearing which has the exact same markings as the top bearing out of my SL6. The bottom bearing is S162500005 for the Aethos.

[poulhansen]

Thanks