Trek Checkpoint: aluminium (ALR) or carbon (SL) gravel

The Checkpoint is Trek's gravel bike. The ALR models are aluminium; the SL models are OCLV carbon with electronic shifting. All of them run Bontrager Girona Pro Tubeless Ready tyres.

Version	Frame	Drivetrain	Wheels	Brakes
ALR 3	Aluminium	Shimano CUES, 10-speed	Paradigm 23	Tektro mechanical
ALR 4	Aluminium	Shimano CUES, 11-speed	Paradigm 23	Shimano CUES
ALR 5	Aluminium	SRAM Apex, 12-speed	Paradigm 23	SRAM Apex
SL 5 AXS	Carbon	SRAM Apex AXS, 12-speed	Paradigm SL	SRAM Apex
SL 6 AXS	Carbon	SRAM Rival AXS, 13-speed	Paradigm Comp 25	SRAM Rival
SL 7 AXS	Carbon	SRAM Force AXS, 13-speed	Aeolus Elite 35V, carbon	SRAM Force

Which one to choose

ALR 3 to get started in gravel. ALR 4 if you want a wider gear range, with 11 gears. ALR 5 if you're after a 12-speed SRAM groupset. SL 5 if you want carbon and electronic shifting. SL 6 and SL 7 step up to 13-speed groupsets, and the SL 7 adds carbon wheels.

Torn between two? See ALR 4 vs ALR 5 or the carbon SL 5, SL 6 and SL 7.

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