56/42 | 54/42 - Our Aero/TT Sets are the result of relentless testing and tweaking, matched with the best material and manufacturing processes.  They are machined from 7075 T6 aluminum and hard anodized for even more durability.

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PRODUCT54/42 or 56/42
130mm Bolt Circle Diameter Time Trial sets
BUY THIS IF : You are wanting larger Time Trial gearing or refresh the TT ring set on your current 5-ARM 130BCD Road/TT crank.
DESIGN/STYLEPlease see all photos above...
Solid ring TT / Aero styling
MFGCNC Machined | 7075-T6 Aluminum
For both 5-arm AND 4-arm w/hidden 5th (like older SRAM Exogram)
Long & short replaceable threaded chain catch pins included (See Pic)
GEARING54/42, 56/42
AVG. WEIGHT54/42 = 210g
CHAIN10 / 11sp Compatible | Shimano/SRAM/CAMPY/KMC
DRIVETRAINSHIMANO -Fully compatible with both Di2 and mechanical Shimano 10/11sp.
SRAM -Fully compatible with both e-Tap and mechanical SRAM 10/11sp.
CAMPY -Fully compatible with both EPS and mechanical Campy 10/11sp.
POWERThese 130BCD TT sets are compatible with spider-based power meters such as Power2Max, SRM and Quarq
NOTE!At this time, these TT sets are only compatible with 10/11sp drivetrains.
TECHNOLOGYOriginal LevaTime Shifting



Praxis warrants components to be free from defects in materials or workmanship for a period of 2 years after original purchase to the original owner. 


USA orders placed after 12:00pm M-F are shipped the next business day. Any orders placed over a weekend or holiday will be processed and shipped the next business day.   We only deliver orders to physical mailing addresses within the United States, and cannot ship to PO boxes, APO or FPO

30 DAY / RETURNS – At Praxis, we are a core group of riders that believe you should be completely satisfied with the purchase you have made. Should an item purchased through the Praxis Online Store fail to meet your expectations, we will gladly accept its return within 30 days of original purchase date.