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With broad arms and graceful curves, the Trimax Compact TT brings effective aerodynamics to an affordable alloy crankset. BB30 and MegaExo options. BB30 use a stiff, strong 7075 aluminum spindle. The chainrings are 7075 too, ensuring low weight and good wear characteristics. As well as the conventional 50/34 compact setup, the Compact is also available with semi-compact 52/38 chainrings using the same BCD, a useful middle ground between compact and traditional chainring sizes.