Giant Propel Advanced 1 vs Specialized Tarmac SL8 Comp - Shimano 105 Di2

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

The short answer

For a typical all-round rider the Specialized Tarmac SL8 Comp - Shimano 105 Di2 comes out ahead (74% against 72%). That is not a universal verdict — change the terrain or the priority and the order can flip.

Giant

Propel Advanced 1

72% for a typical rider

£3,499 at Brand website

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Specialized

Tarmac SL8 Comp - Shimano 105 Di2

74% for a typical rider

£3,599 at Brand website

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What actually separates them

Price: The Giant Propel Advanced 1 is £100 cheaper — £3,499 against £3,599.
Weight: The Specialized Tarmac SL8 Comp - Shimano 105 Di2 is 0.6kg lighter, which you notice on long climbs more than anywhere else.

Side by side

Spec	Propel Advanced 1	Tarmac SL8 Comp - Shimano 105 Di2
Price	£3,499	£3,599
Weight	8.3 kg	7.7 kg
Frame	carbon	carbon
Groupset	Shimano 105 Di2 12-speed	Shimano 105 Di2 R7170 2x12 electronic
Stack / reach	1.44	1.43
Tyre clearance	32 mm	32 mm
Lowest gear	27 in	29 in
Mudguard mounts	No	No
Comfort	39	30
Speed	70	81
Climbing	69	74
Value	23	25

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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