Wheel set is suitable for 7-10 speeds. Flower Drum: Novatec, Opening: 100mm in front / 130mm in back, Spokes: Taiwan Pilla, Rim: carbon fiber rim, Number of holes: front 20 / back 24, Weight: Single front wheel about 540g, Single rear wheel About 720g, One pair about 1260g. Wheel set accuracy: horizontal, longitudinal and center deviation shall be controlled within 0.3mm