Kiwi Bike Tours Twizel is a tour operator at 23 Fraser Crescent, Twizel 7901, rated 4.6 from 8 Google reviews. Reviews mention a helpful, flexible guide and e-bikes in good condition on the ride up to Pukaki Flats.
The website describes day and half-day bike tours over sections of the Alps to Ocean trails from Twizel, and a combined minibus and bike day tour from Christchurch to Akaroa or Twizel. Other tours cover the Little River Rail Trail, the Summit Road above Akaroa Harbour, and a bespoke route from Black Forest to Benmore Dam. E-bikes are offered, and the minibuses seat up to 12 passengers. The business also offers bike hire and pickup on the Lake Dunstan Trail from Cromwell to Clyde.
For a guided ride on the Alps to Ocean trails from Twizel, Kiwi Bike Tours is worth a look.