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Specialized Aethos 2 Pro - Shimano Ultegra Di2 vs BMC Roadmachine 01 FOUR

Both are endurance bikes at a similar price. Here is what actually separates them.

The short answer

For a typical all-round rider the Specialized Aethos 2 Pro - Shimano Ultegra Di2 comes out ahead (76% against 74%). That is not a universal verdict — change the terrain or the priority and the order can flip.

Specialized

Aethos 2 Pro - Shimano Ultegra Di2

76% for a typical rider

£7,249 at Brand website
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BMC

Roadmachine 01 FOUR

74% for a typical rider

£7,299 at Brand website
✓ Checked

What actually separates them

Price
The Specialized Aethos 2 Pro - Shimano Ultegra Di2 is £50 cheaper — £7,249 against £7,299.
Weight
The Specialized Aethos 2 Pro - Shimano Ultegra Di2 is 1.3kg lighter, which you notice on long climbs more than anywhere else.
Riding position
The BMC Roadmachine 01 FOUR sits you more upright (1.53 stack-to-reach against 1.48). The Specialized Aethos 2 Pro - Shimano Ultegra Di2 is the more aggressive of the two — quicker if you can hold it, harder work if you cannot.
Climbing gear
The BMC Roadmachine 01 FOUR has the easier bottom gear (27 gear inches against 32), which matters more than weight on anything genuinely steep.

Side by side

Spec Aethos 2 Pro - Shimano Ultegra Di2 Roadmachine 01 FOUR
Price £7,249 £7,299
Weight 6.7 kg 8.0 kg
Frame carbon carbon
Groupset Shimano Ultegra Di2 R8100 2x12 electronic Shimano Ultegra Di2 2x12 electronic
Stack / reach 1.48 1.53
Tyre clearance 35 mm 34 mm
Lowest gear 32 in 27 in
Mudguard mounts No No
Comfort 47 69
Speed 83 57
Climbing 77 73
Value 0 0

Neither might be the right answer

This page assumes an average rider. Tell us how you actually ride and we will rank these two against everything else at the price.

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