BMC Kaius 01 THREE vs Specialized Diverge 4 Expert - Shimano GRX Di2
Both are gravel bikes at a similar price. Here is what actually separates them.
The short answer
For a typical all-round rider the Specialized Diverge 4 Expert - Shimano GRX Di2 comes out ahead (72% against 68%). That is not a universal verdict — change the terrain or the priority and the order can flip.
What actually separates them
- Price
- The BMC Kaius 01 THREE is £500 cheaper — £4,999 against £5,499.
- Weight
- The BMC Kaius 01 THREE is 0.6kg lighter, which you notice on long climbs more than anywhere else.
- Riding position
- The Specialized Diverge 4 Expert - Shimano GRX Di2 sits you more upright (1.52 stack-to-reach against 1.45). The BMC Kaius 01 THREE is the more aggressive of the two — quicker if you can hold it, harder work if you cannot.
- Tyre clearance
- The BMC Kaius 01 THREE takes 52mm tyres against 50mm — the single most common thing buyers wish they had more of.
- Climbing gear
- The Specialized Diverge 4 Expert - Shimano GRX Di2 has the easier bottom gear (21 gear inches against 25), which matters more than weight on anything genuinely steep.
- Mudguards
- Only the Specialized Diverge 4 Expert - Shimano GRX Di2 takes mudguards, which decides whether it can be your winter bike.
Side by side
| Spec | Kaius 01 THREE | Diverge 4 Expert - Shimano GRX Di2 |
|---|---|---|
| Price | £4,999 | £5,499 |
| Weight | 8.3 kg | 8.9 kg |
| Frame | carbon | carbon |
| Groupset | SRAM Rival XPLR AXS 1x13 electronic | Shimano GRX Di2 RX825 1x12 electronic |
| Stack / reach | 1.45 | 1.52 |
| Tyre clearance | 52 mm | 50 mm |
| Lowest gear | 25 in | 21 in |
| Mudguard mounts | No | Yes |
| Comfort | 66 | 78 |
| Speed | 51 | 36 |
| Climbing | 74 | 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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