Schwalbe Marathon Plus HS 440 (for rehab) The new unflattable tyre for the wheelchair. The Marathon has become the absolute reference for puncture-proof pneumatic tyres on wheelchairs. Now comes the completely new version with even better rolling resistance. In addition, the SmartGuard protective belt is made of a proportion of recycled natural rubber. The "anti-aging" sidewall can withstand the typical overloads caused by insufficient air pressure. Plus the dynamic new tread and new look lettering.