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Giant Defy Advanced SL 0 vs Specialized S-Works Roubaix SL8 - Shimano Dura-Ace Di2

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

The short answer

These two score within 1 point of each other for a typical all-round rider, so there is no single winner — the right one depends entirely on which of the differences below you care about.

Giant

Defy Advanced SL 0

82% for a typical rider

£9,499 at Brand website
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Specialized

S-Works Roubaix SL8 - Shimano Dura-Ace Di2

81% for a typical rider

£12,000 at Brand website
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What actually separates them

Price
The Giant Defy Advanced SL 0 is £2,501 cheaper — £9,499 against £12,000.
Weight
The Giant Defy Advanced SL 0 is 0.3kg lighter, which you notice on long climbs more than anywhere else.
Riding position
The Specialized S-Works Roubaix SL8 - Shimano Dura-Ace Di2 sits you more upright (1.56 stack-to-reach against 1.50). The Giant Defy Advanced SL 0 is the more aggressive of the two — quicker if you can hold it, harder work if you cannot.
Climbing gear
The Giant Defy Advanced SL 0 has the easier bottom gear (25 gear inches against 27), which matters more than weight on anything genuinely steep.

Side by side

Spec Defy Advanced SL 0 S-Works Roubaix SL8 - Shimano Dura-Ace Di2
Price £9,499 £12,000
Weight 7.0 kg 7.3 kg
Frame carbon carbon
Groupset SRAM RED AXS E1 12-speed Shimano Dura-Ace Di2 R9200 2x12 electronic
Stack / reach 1.50 1.56
Tyre clearance 40 mm 40 mm
Lowest gear 25 in 27 in
Mudguard mounts Yes Yes
Comfort 64 73
Speed 73 64
Climbing 91 83
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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