Frequently Asked Questions
Use limitation for Carbon Wheels
Standard carbon wheels are designed for lightweight and high-performance use. The overwhelming majority of high performance cyclist are light weight people, accordingly most carbon wheels are not designed for heavy riders and therefore have a weight limit rating on them:
- Rim Brake Carbon wheel with a profile below 45mm: 90Kg (total weight of rider, bicycle and equipment)
- Rim Brake Carbon wheel with a profile of 45mm and above: 100Kg (total weight of rider, bicycle and equipment)
- Disk Brake Carbon wheels: 110Kg (total weight of rider, bicycle and equipment)
- Carbon wheels are not designed for tandem bicycle use.
If you are a heavier rider, intend to carry significant load on your bicycle, intend to make significant jumps, ride downhill off road, or the wheels are intended for a tandem, standard competitive lightweight carbon wheels are likely not adapted for your intended use. Please contact us so we can propose wheels that are properly designed for your use profile.
Air Pressure and Braking
Carbon wheels with rim brakes generate significant heat from braking. Epoxy resins used in carbon composite are less temperature resistant than aluminum. The heat does not dissipate as well as with aluminum rims. These facts create limitations with regards to braking and air pressure in the use of carbon rims when using disk brakes.
For clincher road tires, the maximum inflating pressure of a cold tire and rim is 7 bars or 100 psi. Check the tire manufacturer recommendation as many larger tires (over 25mm) now have significantly lower maximum pressure recommendations.
For tubeless tires, lower pressure the maximum inflating pressure of a cold tire and rim is 5 ot 6 bars or 70 to 85 psi. Check the tire manufacturer recommendation as many larger tires (over 25mm) now have significantly lower maximum pressure recommendations.
For tubular tires, the maximum pressure should be the maximum pressure recommended by the manufacturer minus 10%. Please follow the glueing instructions and use the glueing materials recommended by the tubular manufacturer.
Important Note: Carbon rims with rim brakes were initially designed for experienced competitive riders who usually descend fast with minimal braking resulting in limited heat creation in the braking system. If you are a heavy rider, if you intend to carry load, or if are an inexperienced rider who feels the need to brake continuously on long descents to control your speed, you SHOULD NOT be using carbon rims with rim brakes as overheating may lead to tire blow ups and carbon rims may not withstand the heat from prolonged braking under load. This is one of the main reasons the bike industry has moved towards disk brakes to avoid this limitation for heavier and less experienced riders.
The general warranty policy of ROI Cycles is for 12 months from the date of purchase to the person that made the original purchase and holding the original invoice.
The warranty covers any manufacturing or assembly defect but not wear and tear generated by normal use.
ROI Cycles will either repair or replace the defective product at its sole discretion.
Talk to us, we are here to help
Please read our blogs regarding wheels, explanations behind technology choices and recommendations.
In case you need to make choices or you face technical issues, do not hesitate to contact us for support, even if your case is not a typical warranty case but the damage comes from wear or a crash. Even if you are trying to decide if an existing wheel set can be serviced or repaired. With ROI Cycles you are dealing with someone that can take a wheel apart and rebuild it and in most cases wheels can be serviced and brought back to satisfactory use with a change of some components whether it is cartridge bearings, broken spokes or bent rims.