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Giant Defy Advanced Pro 0 vs Specialized Aethos 2 Expert - Shimano Ultegra Di2

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

The short answer

For a typical all-round rider the Giant Defy Advanced Pro 0 comes out ahead (77% against 74%). That is not a universal verdict — change the terrain or the priority and the order can flip.

Giant

Defy Advanced Pro 0

77% for a typical rider

£5,499 at Brand website
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Specialized

Aethos 2 Expert - Shimano Ultegra Di2

74% for a typical rider

£5,499 at Brand website
✓ Checked

What actually separates them

Weight
The Specialized Aethos 2 Expert - Shimano Ultegra Di2 is 0.8kg lighter, which you notice on long climbs more than anywhere else.
Tyre clearance
The Giant Defy Advanced Pro 0 takes 40mm tyres against 35mm — the single most common thing buyers wish they had more of.
Climbing gear
The Giant Defy Advanced Pro 0 has the easier bottom gear (27 gear inches against 32), which matters more than weight on anything genuinely steep.
Mudguards
Only the Giant Defy Advanced Pro 0 takes mudguards, which decides whether it can be your winter bike.

Side by side

Spec Defy Advanced Pro 0 Aethos 2 Expert - Shimano Ultegra Di2
Price £5,499 £5,499
Weight 7.9 kg 7.1 kg
Frame carbon carbon
Groupset Shimano Ultegra Di2 12-speed Shimano Ultegra Di2 R8170 2x12 electronic
Stack / reach 1.50 1.48
Tyre clearance 40 mm 35 mm
Lowest gear 27 in 32 in
Mudguard mounts Yes No
Comfort 64 47
Speed 62 79
Climbing 74 72
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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