Colnago G4-X Shimano GRX 820 2x vs Orro Terra Ti 105 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 Orro Terra Ti 105 Di2 comes out ahead (65% against 57%). That is not a universal verdict — change the terrain or the priority and the order can flip.
What actually separates them
- Price
- The Colnago G4-X Shimano GRX 820 2x is £299 cheaper — £4,101 against £4,400.
- Weight
- The Colnago G4-X Shimano GRX 820 2x is 0.5kg lighter, which you notice on long climbs more than anywhere else.
- Riding position
- The Orro Terra Ti 105 Di2 sits you more upright (1.52 stack-to-reach against 1.48). The Colnago G4-X Shimano GRX 820 2x is the more aggressive of the two — quicker if you can hold it, harder work if you cannot.
- Tyre clearance
- The Orro Terra Ti 105 Di2 takes 44mm tyres against 42mm — the single most common thing buyers wish they had more of.
- Climbing gear
- The Colnago G4-X Shimano GRX 820 2x has the easier bottom gear (23 gear inches against 26), which matters more than weight on anything genuinely steep.
- Shifting
- Only the Orro Terra Ti 105 Di2 has electronic shifting. Crisper and lower maintenance, but it needs charging and costs more to replace.
- Mudguards
- Only the Orro Terra Ti 105 Di2 takes mudguards, which decides whether it can be your winter bike.
Side by side
| Spec | G4-X Shimano GRX 820 2x | Terra Ti 105 Di2 |
|---|---|---|
| Price | £4,101 | £4,400 |
| Weight | 9.5 kg | 10.0 kg |
| Frame | carbon | titanium |
| Groupset | Shimano GRX 820 2x12 mechanical | Shimano 105 Di2 R7100 12-speed |
| Stack / reach | 1.48 | 1.52 |
| Tyre clearance | 42 mm | 44 mm |
| Lowest gear | 23 in | 26 in |
| Mudguard mounts | No | Yes |
| Comfort | 70 | 80 |
| Speed | 34 | 24 |
| Climbing | 62 | 50 |
| 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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