A carbon rim, precisely tensioned spokes and a reliable hub. IDEA wheel quality comes from how they work together — from development and measurement to hand building and long-term servicing.
Aerodynamic and deformation simulations help compare rims and spokes. We also choose rim depth to suit the terrain and riding style, rather than relying on a single test result.
02
The precision of hand building
Rim dimensions, spoke lengths, hub drilling and lacing must work together. Checking the wheel build and spoke tension matters too.
03
Wheels with long-term support
Individually replaceable IDEA carbon spokes, conventional truing and documented bearing dimensions make ongoing wheel care and servicing easier.
FROM TRAINING BACK TO THE WORKSHOP
Experience complements measurement
Team experience connects riding, equipment selection and servicing. The Rafkarna IDEA Cycling Team name reflects the long-term partnership with Rafkarna and its IDEA brand.
Dimensions for the specific model and compatible hubs. Spoke lengths are listed for each side of the front and rear wheels.
ERD / effective rim diameter550 mm
Internal / external width23/28 mm
Spoke tension140 kg
Spoke lengths for IDEA R45 CALOBRA ULTRA
Spoke position
Length
Front / disc side
268 mm
Front / opposite side
265 mm
Rear / disc side
274 mm
Rear / opposite side
265 mm
Tension is a wheel construction specification; it is not the rider weight limit. Weights refer to standard catalogue specifications.
Compatible spoke
Model
IDEA F1 ULTRA CARBON SP
Profile
aero
Material
Carbon
Dimensions
3.6x1.0 mm
Thread
4.0 mm
Rim and wheelset
Rim depth
45 mm
Rim weight
380 g
Profile type
hookless
Pair weight
1250 g
Weight limit
140 kg
IDEA carbon spokes are individually replaceable and allow conventional truing. For hubs, drilling and lacing, open the Hubs & bearings tab.
03 / IDEA TEST LAB
Measure, compare Understand the differences
In a simulation at 50 km/h, R55 CALOBRA had the lowest drag of the three road rims tested. A deeper rim is not automatically the answer for every route — lighter, shallower rims also have their place in the hills and on rolling terrain.
