Optimize Your Bike Equipped with Shimano 105 Di2
Many 105 Di2 builds (typically €3,500–€5,000) sit on excellent, often aerodynamic frames. The stock components are what cap the overall efficiency. By upgrading the crankset, chainrings and bottom bracket, you unlock the frame’s potential without overspending.
Crankset: the core of performance
The Shimano 105 Di2 crankset weighs about 765 g. It strongly influences stiffness and power transfer.
Rotor Vegast 30 mm (12s)
The smart Q/P choice: 30 mm axle (~80 g lighter vs 24 mm), excellent power transfer. Pair with 12-speed chainrings and a BB86 suited to your frame.
See Rotor Vegast 12s (24 or 30 mm)Rotor Aldhu Carbon (12s)
The light/nervous option: around 200 g saved vs 105. Ideal for rolling and hilly terrain while keeping a crisp feel.
See Aldhu Carbon (12s)Chainrings: stiffness & longevity
Stock 105 chainrings are the weak link for powerful riders. Upgrading improves shift consistency and stiffness.
Recommended: Rotor round chainring kit for Shimano 12s cranks – boosts rigidity and shifting precision on your 105 crank.
- 52/36: balanced for flats + climbs (club/fast group rides)
- 53/39: for racing and sustained high-speed sections
Bottom Bracket: smooth power
The stock 105 BB is robust but not the smoothest. A correct BB86 choice stabilizes chainline and cuts friction.
Keep your 105 crank (Canyon/Scott)
Simple upgrade without changing your 105 crankset:
DCTech BB86-92 Shimano (Bikone) — steel bearingsSwitch to a 30 mm axle crank
For Canyon / Scott / Lapierre frames when installing a 30 mm axle crank (Vegast or Aldhu):
DCTech BB86-92 4130 steel (Bikone)Rear Derailleur: ceramic pulleys / OSPW
Stock pulleys add drag. Ceramic pulleys are a quick win; an oversized cage goes further for steady watts.
CyclingCeramic OSPW for Shimano 12-speed (Ultegra 8150/9250) — Pro Solid AeroWheel Bearings: speed matters
At high speed, smooth bearings make a real difference. Many stock wheels — whether from Zipp, DT Swiss, Roval, Mavic, Shimano, Campagnolo, Corima, or Vision — are equipped with basic steel bearings that generate unnecessary drag. Replacing them with high-quality ceramic wheel bearings dramatically improves fluidity, helping you hold group-ride speed with less effort and unlock the full performance of any wheelset.
Quick FAQ
Is the 105 Di2 crankset limiting performance?
Aldhu Carbon or Vegast 30 mm — which to choose?
Do I need to change the BB86 as well?
What about chainrings on 105?
