3 wheeler pushchair jogger pushchair max user weight 20 kg recommended user age new born 4 years lightweight hand brake footplate quick relase for all wheels wrist strap recommended minimum age new born pushchair weight 98 kg backrest multiple harness system 5 point safety harness slider adjustable series outnabout nipper sport wheel type pneumatic tyres wheel diameter rear 41 cm wheel diameter front 41 cm number of wheels 3 dimensions