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The 650b is touted as the best of both worlds when that's not really a fair assessment.
Rather it's halfway in-between two worlds.

It's a bit lighter than 29" and a bit heavier than 26". It rolls over obstacles better than 26" but not as good as a 29". 
The Speed one M8 650b is built of a Reynolds 853 seamless air-hardening steel tube set, the ultimate tensile strength of which is 1250~1400 MPa.
Stiffness and strength are improved by heat treatment.

SRAM X01 was built with a dedicated 1X drivetrain philosophy—making it simpler, lighter and more durable than any other.

No matter where you ride, no matter what you’re up against: SRAM X01.

Item Sram X01 Sram X0    
Size 15, 17, 19, 21" 15, 17, 19, 21"    
Frame Reynolds 853 Reynolds 853    
Fork Rockshox Reba RLT Rockshox Reba RLT    
Shock N/A N/A    
Headset FSA No.57 ACB 1-1/8" Upper 1.5" FSA No.57 ACB 1-1/8" Upper 1.5"    
Braze on Adapter N/A N/A    
Frame weight 2.12 kg(17") 2.12 kg(17")    
Colors Scotch-brite Scotch-brite    
Front Derailleur N/A Sram X0    
Rear Derailleur Sram X01 Sram X0    
Shifter Sram X01 Trigger Sram X0 Trigger    
Brakes Sram X01 Disc Sram X0 Disc    
Crankset Sram X01 PF30 34T Sram X0 PF30 39-26T    
BB adapter N/A N/A    
Cassette Sram XG 1195 10-42T 11sp Sram PG1070 11-36T 10sp    
Chain Sram XX1 11sp KMC X10SL-Ti 10sp    
Handlebar FSA K-Force FSA K-Force    
Stem FSA K-Force FSA K-Force    
Seatpost FSA K-Force SB0 ø31.6 FSA K-Force SB0 ø31.6    
Wheel Set Token Vigilante V23AB Token Vigilante V23AB    
Tires Maxxis Crossmark  27.5" 650b Maxxis Crossmark  27.5" 650b    
Saddle Prologo Scratch Pro Ti 1.4 Prologo Scratch Pro Ti 1.4    
Bar Tape/Grip Velo Velo    
Weight(w/o pedal) 10.9 kg(17") 11.5 kg(17")    


Specifications are subject to change without notice.Color availability depends on current stock.

PF30 - All the Best From BB30 and Press-Fit

PF30 is all the best from BB30 and Press-Fit bottom brackets in one captivating package. This bottom bracket is designed for 30mm spindle cranksets. The key difference with PressFit 30 is how the bearings are fitted into the frame. Bearings are housed in nylon cups which will be pressed into the frames bottom bracket shell. Advantages: Huge weight savings, greater bearing durability, more ankle clearance, stiffer and stronger crank construction, simple installation.

The maintenance of steel frame

The charming slim tube, the timeless epic, faithful paddle power, excellent rough road absorption, these steel bike character is too strong temptation for the cyclist to resist. All Speed one bike have complicated electroplating rust treatment when it ship out the factory.