Onderwater Tandems

Great fun to ride, these special bikes designed by Ronald Onderwater steer from the back seat and have a free-wheel mechanism for the child pedallers seated in front. Keep your children in sight, with an uninterrupted view ahead for everyone. These models are a great success for carers of special needs children who unable to pedal on their own – the sense of participation is positive and rewarding, and in some cases balance is improved. Pedal cranks and seat post lengths can be customised to fit riders of all sizes.
Both models can be fitted with an extra toddler seat in front of the adult rider, and/or a toddler/ junior seat at the rear, with the option to add panniers.

Onderwater Transporter

Onderwater Tandem TA4: 1 adult & 1 child pedalling

Specification
Brakes: Shimano roller brakes with potential upgrade to hydraulic rim brakes.
Lights: Hub dynamo powered 35 lux headlamp with standlight. LED battery rear light or optional dynamo powered Plateo rear light with standlight.
Tyres: Standard Schwalbe Marathon with Schwalbe Marathon Plus option.
Security: Axa integral lock is fitted to rear wheel, with an optional plug-in chain.
Gears: Shimano Nexus hub gears or Nuvinci constantly variable hub.
Finish: Very durable powder coat paintwork and lots of stainless steel parts mean that the bike will keep its new appearance for many years and retain a high resale value.

Gear Options

Nexus 3 speed, roller brakes TA4 NN3D £1,650
Nexus 7 speed, roller brakes TA4 NN7D £1,710
Nexus 8 speed, roller brakes TA4 NN8D £1,760
Nuvinci CVT, roller brakes TA4NuVinD £1,950
Front wheel motor & frame mounted battery OPTI.010463 additional £1,450
Schwalbe Marathon Plus Tyres £45
Bobike Maxi + rear seat max 25kg £85
Bobike Junior rear seat max 35kg £85
Extra seat and footplate in front of adult £60
150mm pedal cranks for child £44
10cms higher seat tube bracket for child £22
Rear light powered by the hub dynamo £27
IM 81 Rollerbrake £26
IM 80 Rollerbrake £22
Magura HS 11 hydraulic V brakes £184
Axa Solid plus lock with 1.0 plug-in extension chain £19
Axa Solid plus lock with 1.4 plug-in extension chain £21
Onderwater Triplet

Onderwater Tandem XL: 1 adult & 2 children pedalling

The most fun bike in our collection! Two children can pedal along or freewheel when they get tired: a NuVinci constantly variable rear hub is fitted as standard which means no clunky gear changes, and you can put in the right pedalling effort for the terrain.
The bike can also be turned into recumbent with child (up to 10yrs) at the front, by removing the rear set of child’s pedals & seat, and fitting a bucket seat with swept back handlebars.

Specification
Brakes: Shimano roller brakes with potential upgrade to hydraulic rim brakes.
Lights: Hub dynamo powered 35 lux headlamp with standlight. LED battery rear light or optional dynamo powered Plateo rear light with standlight.
Tyres: Standard Schwalbe Marathon with Schwalbe Marathon Plus option.
Security: Axa integral lock is fitted to rear wheel, with an optional plug-in chain.
Gears: Nuvinci constantly variable hub.
Finish: Very durable powder coat paintwork and lots of stainless steel parts mean that the bike will keep its new appearance for many years and retain a high resale value.

Gear Options

Nuvinci CVT  with IM81 roller brakes XL NuVinD £2,299
Front wheel motor & frame mounted battery OPTI.010463 additional £1,450
Schwalbe Marathon Plus £45
Bobike Maxi + rear seat max 25kg £85
Bobike Junior rear seat max 35kg £85
Extra seat and footplate in front of adult £60
150mm pedal cranks for child £44
10cms higher seat tube bracket for child £22
Rear light powered by the hub dynamo £27
IM 81 Rollerbrake £26
IM 80 Rollerbrake £22
Magura HS 11 hydraulic V brakes £184
Recumbent seat and belts £580
Axa Solid plus lock 1.0m extension chain £19
Axa Solid plus lock 1.4m extension chain £21