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Kolb Rahmenbau Aerocross Awardwinner

The mission was to build a fast, capable roadbike. An allroad, cyclocross, endurance call it how you want. No gravelbike tank and no touringbike either. It should be able to handle fast road rides, twisty descends and fit 33c cyclocross tires to have fun drifting on muddy trails during winter. When in need of a 650b 55mm tire monster I happily ride my mountainbike. This bike should "just" be a more robust personalized version of my old trek crockett. As you can probably tell the look is inspired by English Cycles, FES Track bikes and Weismf. The geometry is pretty much copied from Treks boone... Just to get one important thing out of the way. Let's all agree that straight non sloping toptubes look nicer! We can all agree on that? But I have short legs end of the discussion... When I showed Njazi from Scampi Cicli the drawings he said: "That's a nice looking womens bike! Is it for your girlfriend?". The special headtube construction has a square cut out window for the stem to fit trough. This aero cockpit style was something I had only seen with custom stems before. Unfortunatly they look very bulky and outdated. This might be fine hidden under massive timetrail bars but not on a road bike. Ritchey's elegant aero stem was an easy pick. An other special detail is the seattube. It has no visible external seat clamp or even a bolt. Because of the dropped seatstays there is a lot of punktual force on the seattube that is normaly suportet by the toptube on the oposite side. To disperse this pressure points the sleeves were nessesary. In my opinion sleeves only look nice with a carbon seattube slided through. We discovered that there is no way to integrate or hide them. The solution is to embrace and accentuate the sleeved look even on a full steel frame. For this process Wim heated those sleeves to get the amazing blueish rainbow finish like on exhausts and then sanded of the blue from the seattube. This gave the desired contrast without the use of a bonded carbon seattube. To complete the look and go the extra mile Kolb Rahmenbau even brazed a sleeve at the bb area so that the optical ilusion makes you think a separate seattube was inserted in to the sleeves of the main frame. The cable routing was another big decision to take. After seeing Claudias prototype Stelbel with internal cables on a basic sleek stem and headset it was tempting to go full internal. It would have matched with the aero cockpit style but I realy do enjoy maintaining my bikes and I can proudly say that I never had to replace a headsetbearing in my entire life. I enjoy the meditative process of cleaning and regreaseing bearings regularly. Beeing forced to re-rout the brakehose and bleed the brakes are some additional steps that will certainly not increase my motivation to regularly perform headset services. On a sunny weather roadbike I would not hesitate to get the clean integreation but on this allweather beast the "cables" are outside of the stem and headset. The frame was specialy designed for shimano 12speed di2 which is ''semi wireless''. So there are no holes for a mechanical Sti. The unfinished industrial raw style of a bare frame for me personaly is perfection. It highlights all those hours of labour that went in to smoothening the fillets. Painted steel frames hide a lot of what is going on. The challenge with columbus spirit tubing is they will start to rust. Even many layers of clearcoat or clear powdercoating can't stop corrosion. According to some forums a new process called cerakote seems to be the only possible solution. Columbus doesn't give any reliable recomandations about techniques, paint or the amount of coats. Patrick from Dreier Cycles in Zurich told me one coat of cerakote should be enough. Just to be on the safe side I asked him to do two layers of cerakote.m. For some painting engenier reason I don't know he even did 4 coatings of ceracote. It looks like raw and is only 0.08mm thick hard ceramiccoated. Swiss winters should have no chance against bulletproof cerakote but only time will tell how this paintjob realy lasts under real world conditions. I'm stoked on how this build came out and can't wait to explore some places and hunt some new KOM's on it. See you out there on the streets, in the woods and on Strava.

Frame:
Wim Kolb from Kolb Rahmenbau fillet brazed custom frame with Columbus max toptube. 38mm spirit downtube. Custom spirit headtube, chain- and seatstay, T47bb and pmw stainless x12 Syntace dropouts with Shimano direct mount hanger. Weight transparency data: -Raw unpainted frame 2260g -Painted frame with 4x 20µ Cerakoatings (0,08mm total) 2310g

Fork/Headset:
Carbon Brother Cycles Road Fork / Axle-to-crown 381mm / Offset 45 / tapered 1 1/8 – 1 1/2″ / 100x12mm CARBON-TI X-Lock EVO M12x1.5Px120mm Axle / Hope EC44/40 lower bearing 52mm 40mm 45&45 / Custom adapted ZS44/28.6 silver

Crankset/Bottom Bracket:
Ultegra FC-R8100 50/34 165mm / Chris King T47i 24mm Ceramic matte slate

Pedals:
XTR PD-M9100 tuned with Meti grade 5 titanium axels and 686 6x13x5 ceramicspeed coated bearings or stock Dura-Ace PD-R9100

Drivetrain/Cog/Chainring/Chain:
Cassette Dura-Ace CS-R9200 11-34 / Chain "Dura-Ace" XTR CN-M9100 waxed with silca secret hot blend wax

Derailleurs/Shifters:
Ultegra Di2 RD-R8150 / FD-R8150 / ST-R8170 with Y63X98050 Ti clamp band unit

Handlebars/Stem:
Pro Carbon 400mm / Custom Ritchey Chicane WCS 110mm with tubus tara Ti custom drilled garmin mount

Saddle/Seatpost:
Pro Carbon / Thomson Masterpiece 27,2 with Custom long Di2 wedge handmade from Rob English tuned with smud-carbon cradle and titanium hardware

Brakes:
Dura-Ace BR-R9270 front / XTR BR-M9110 rear because the XTR bleed nipple is not sideways. The new 9270 bleed boss is on the outside and covered from the lowered seatstay so it would be mandatory to dismount the brakecaliper to bleeding the system. BCA Yoda Centerlock 240/160mm rotors

Front Wheel/Hub/Tire:
Nextie Carbon 50mm NXT50GX ERD541mm 425g 50x29x22mm laced with 24 Sapim CX-Ray to DT-SWISS 350 with black Sapim polyax 12mm brass nippel and Sapim 0.6x9,5x14 mm stainless plates / Vittoria Corsa Control 28c or Vittoria Terreno Mix 33c with Latex tubes

Rear Wheel/Hub/Tire:
Nextie Carbon 50mm NXT50GX ERD541mm 425g 50x29x22mm laced with 28 Sapim CX-Ray to DT-SWISS 350 with black Sapim polyax 12mm brass nippel and Sapim 0.6x9,5x14 mm stainless plates / Vittoria Corsa Control 28c or Vittoria Terreno Mix 33c with Latex tubes

Accessories:
2x King Cage Titanium / plenty of Pro-Bolts drilled titanium racebolts / Meti Titanium Pedal Axels from italy / Bike-Attitude CNC Lockrings /

More Info:
Maintanance Intervalls: -grease seatpost every 12 month, -apply body cavity spray every 12 month. Total weight 9.6kg in CX mode and 9,4kg in road mode. Next Paintjob will be a purpleish blue on the front triangle with a dirty sprinkled fade to a dark grey rear triangle. Fork and seattube will stay classy in semi-gloss black.

Bike History

Click a link below to see past stages of this bike.

  1. Showbike
  2. How it rides best
  3. New Wheelset

Added by ianiscaratti. Last updated 6 days ago.

38 Comments

Thor

Thor says:

What a story!!! Great bike!!!

Posted 8 months ago

ianiscaratti

ianiscaratti says:

Thank you a lot

Posted 8 months ago

henry510

henry510 says:

did you already swap the crankset to the R7000 model? and new stem with no headset dust cap? What was your reasoning?

Posted 8 months ago

ianiscaratti

ianiscaratti says:

Simple: Even if I work for Shimano and and ordered the groupset back in 2021, I'm still waiting for the Crank. The R8100 on the contest was a crank that Scampi Cicli lent me. Now I have to ride the available and cheap 105 till my crank will be delivered. Extralite stem is some serious weightwheenie stuff. How this cnc masterpiece flexes and clamps is just scary. The Ritches is 120g heavier but I trust it lol.

Posted 8 months ago

henry510

henry510 says:

Makes perfect sense, thanks for the reply.

Posted 8 months ago

ianiscaratti

ianiscaratti says:

Check this feature out https://www.instagram.com/p/CeJjvLYsK5G...

Posted 8 months ago

henry510

henry510 says:

probably my favorite bike on this website now.

Posted 8 months ago

NicolasCalifornia

NicolasCalifornia says:

How is the ride? I see you already bifft

Posted 8 months ago

ianiscaratti

ianiscaratti says:

It rides amazing like expected but I haven't been on cx tires since last winter (ca. nov 2021/ 7 month ago). They terreno mix drift very predictable on trails and gravel but cx tires are scary on tarmac. Luckily only the Sti is broken and should be exchanged soon.

Posted 8 months ago

sublorange

sublorange says:

I'm saying this with great affection: this is a fucking bicyclepubes bike.

Posted 9 months ago

ianiscaratti

ianiscaratti says:

Thank you but what do you mean by pubesbike lol?

Posted 9 months ago

sublorange

sublorange says:

there is an instagram account named @bicyclepubes that makes fun of current trends in "alternative cycling", initially as drawings made in MS Paint and now as fully built monstrosities. genuinely though, congratulations on realizing your vision on such a unique bike!

Posted 9 months ago

ianiscaratti

ianiscaratti says:

ok now i get what you mean and ys it is very very extreme lookung but in the exact way i wanted it. Maby it will get featured on the pubes meme account you mentioned lol

Posted 9 months ago

anton

anton says:

Woohoo 100th update and we finally see a bike

Posted 9 months ago

metatronic1123

metatronic1123 says:

lol

Posted 9 months ago

ianiscaratti

ianiscaratti says:

relax lol

Posted 9 months ago

_nico

_nico says:

Couldn't believe it either ...

Posted 9 months ago

ianiscaratti

ianiscaratti says:

you guys are joking. it was planed for 2023 but the framebuilder found some more time that's why it is already finished now.

Posted 9 months ago

metatronic1123

metatronic1123 says:

This this is crazy, I love it!

Posted 9 months ago

ianiscaratti

ianiscaratti says:

Thank you and yes it is

Posted 9 months ago

NicolasCalifornia

NicolasCalifornia says:

Have Kolb remove that gusset and replace with one a fraction of the size, what the hell are thinking?

Posted 9 months ago

ianiscaratti

ianiscaratti says:

do you man the sleeves on the seattube by gusset?

Posted 9 months ago

Blokk

Blokk says:

wild. definitley no beauty, but i like it

Posted 9 months ago

ianiscaratti

ianiscaratti says:

it is very controverse but I love it and it's nice that you like it too

Posted 9 months ago

ianiscaratti

ianiscaratti says:

Check this feature out https://www.instagram.com/p/CeJjvLYsK5G...

Posted 8 months ago

henry510

henry510 says:

frame looks amazing already. i really like the aero headtube cut out.

Posted 9 months ago

ianiscaratti

ianiscaratti says:

Thank you I love it even if ir is very big and heavy but so unique

Posted 9 months ago

evisu

evisu says:

So far, so interesting.

Posted 9 months ago

ianiscaratti

ianiscaratti says:

still in school but can't wait to start building it tonight. stay tuned

Posted 9 months ago

ianiscaratti

ianiscaratti says:

Check this feature out https://www.instagram.com/p/CeJjvLYsK5G...

Posted 8 months ago

63r1

63r1 says:

can't wait to see this thing!

Posted 11 months ago

ianiscaratti

ianiscaratti says:

me neither!

Posted 11 months ago

ianiscaratti

ianiscaratti says:

Check this feature out

https://www.instagram.com/p/CeJjvLYsK5G...

Posted 8 months ago

Grant4

Grant4 says:

I don't get some of the pics.

Posted 11 months ago

ianiscaratti

ianiscaratti says:

How about now?

Posted 9 months ago

ianiscaratti

ianiscaratti says:

Check this feature out https://www.instagram.com/p/CeJjvLYsK5G...

Posted 8 months ago

NicolasCalifornia

NicolasCalifornia says:

the aggressive!

Posted about 1 year ago

GhostRidingTheWhip

GhostRidingTheWhip says:

+1

Posted about 1 year ago