Key:mtb:scale:imba
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 mtb:scale:imba
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| Description |
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A classification scheme for the difficulty of specifically designed trails for mountainbiking. 
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| Group: properties |
| Used on these elements |
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| Useful combination |
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Status: approved
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| Tools for this tag |
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The Trail Difficulty Rating System shall be used for mountain bike trails which are specifically designed and designated for mountain biking, to be found in "Bikeparks", for example. For "natural" trails it is advised to use mtb:scale=* and mtb:scale:uphill=* instead.
mtb:scale:imba=0 to 4.
0 refers to Easiest (white circle), 1 is Easy (green circle), 2 is More Difficult (blue square), 3 is Very Difficult (black diamond), and 4 is Extremely Difficult (double black diamond).
| Tag / Category | Trail width | Tread Surface | Average Grade | Maximum Grade | Unavoidable obstacles | Unavoidable bridges | Technical Trail Features | Other |
|---|---|---|---|---|---|---|---|---|
| mtb:scale:imba=0 ⚪ Easiest (White Circle) |
1.8m (72") or more | Hardened or surfaced | < 5% | Max 10% | None | None | None | No obstacles |
| mtb:scale:imba=1 🟢 Easy (Green Circle) |
0.9m (36") or more | Firm and stable | 5% or less | Max 15% | 5 cm (2") tall or less | 0.9m (36") or wider | None | Avoidable obstacles may be present |
| mtb:scale:imba=2 🟦 More difficult (Blue Square) |
0.6m (24") or more | Mostly stable with some variability | 10% or less | Max 15% or greater | 20 cm (8") or less | 0.6m (24") or wider | 0.6m (24") high or less, width is >1/2 height | Avoidable obstacles may be present |
| mtb:scale:imba=3 ◆ Very difficult (Black Diamond) |
0.3m (12") or more | Widely variable | 15% or less | Max 15% or greater | 38 cm (15") or less | 0.6m (24") or wider | 1.2m (48") high or less, width is < 1/2 height | May include loose rocks, short sections may exceed criteria |
| mtb:scale:imba=4 ◆◆ Extremely difficult (Double Black Diamond) |
0.15m (6") or more | Widely variable and unpredictable | 20% or more | max 15% or greater | 38 cm (15") or less | 0.6m (24") or narrower | 1.2m (48") high or less, width is < 1/2 height | May include loose rocks, many sections may exceed criteria |
| More specific tags | width=* | surface=*, tracktype=* | incline=* | incline=* | smoothness=* | bridge=* + width=* | bridge=* + width=* | n/a |
Graphics reused with permission from IMBA. Updated original found here.
