Her local vet battled to save Mrs T, but feared she would not survive without being mobile. After running up a £1,000 vet bill, Mrs Ryder turned to her mechanical engineer son Dale, 37, for help.
Mrs Ryder said: "She took to them straight away, but she has had to learn how to turn and stop. She can get a good speed up, much faster than before. Mrs T is still quite young for a tortoise. She could go on for another 50 years - all she needs is a new set of tyres every now and again."
Mrs T was in her 60s when she was bought as a pet for Dale when he was eight. It has the run of Mrs Ryder's garden in Pembroke, West Wales, in the spring and summer before being tucked away in in the garden shed to hibernate. But a rat got in last month and chewed off both her front legs to the elbow joint.