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| Manufacturer part # | IS41U-8MM-KNOCK-BLK | IS41U-8MM-KNOCK-BLU | IS41U-8MM-KNOCK-GLD | IS41U-8MM-KNOCK-GRN | IS41U-8MM-KNOCK-ORG | IS41U-8MM-KNOCK-PRP | IS41U-8MM-KNOCK-RED | IS41U-8MM-KNOCK-SIL |
|---|---|---|---|---|---|---|---|---|
| Steerer outer diameter | 28.6mm (1-1/8") | 28.6mm (1-1/8") | 28.6mm (1-1/8") | 28.6mm (1-1/8") | 28.6mm (1-1/8") | 28.6mm (1-1/8") | 28.6mm (1-1/8") | 28.6mm (1-1/8") |
| Crown race inner diameter | Upper only | Upper only | Upper only | Upper only | Upper only | Upper only | Upper only | Upper only |
| Cup Insertion OD | 41mm | 41mm | 41mm | 41mm | 41mm | 41mm | 41mm | 41mm |
| Stack height | 8mm | 8mm | 8mm | 8mm | 8mm | 8mm | 8mm | 8mm |
| Bearing type | Sealed | Sealed | Sealed | Sealed | Sealed | Sealed | Sealed | Sealed |
| Headset type upper | Unthreaded fully integrated | Unthreaded fully integrated | Unthreaded fully integrated | Unthreaded fully integrated | Unthreaded fully integrated | Unthreaded fully integrated | Unthreaded fully integrated | Unthreaded fully integrated |
| Headset type lower | Upper only | Upper only | Upper only | Upper only | Upper only | Upper only | Upper only | Upper only |
| Material | Aluminum | Aluminum | Aluminum | Aluminum | Aluminum | Aluminum | Aluminum | Aluminum |
| Weight | 15g | 15g | 15g | 15g | 15g | 15g | 15g | 15g |