KTM X-Bow

It's completely roofless and aiming for the top – this is X-Bow! Produced by bike maker KTM, the X-Bow (pronounced cross-bow) has the Caterham Seven Superlight R500 in its sights with a vivid body and a host of carbon fibre components.

Power comes from Audi’s 2.0-litre TFSI engine which is tuned to produce 237bhp, giving a 0-60mph time of 3.7 seconds and a top speed of 137mph. It's available in two trims, with the Superlight flagship getting a carbon fibre underfloor and a price tag well excess of £60,000 – some £10,000 more than the entry-level model.

Sales have already begun but this summer the firm will launch a new range-topping model called the X-Bow ROC. Unveiled at the Geneva Motor Show, it's based on the Superlight, but boasts a sports exhaust and Race of Champions badging to celebrate its appearance as one of the competition cars  at Wembley Stadium last year.

The production run will be limited to 30 units, each costing around £60,000. KTM will also launch a new entry-level X-Bow Street this summer too, which is likely to be around £5,000 cheaper than the current version.