Many South Africans claimed him as their own. He did spend many of his formative years in South Africa, and rode for the Barloworld team during his time in Johannesburg.
The sport of professional cycling is just emerging from the so called "Armstrong period", where performance enhancing drugs were the norm and everybody was involved in illegal practices. Froome represents the new breed of cyclist, one who works hard, but plays fair.
Chris Froome rode for Great Britain and he had a subtle Kenyan flag on his bike, but there is no doubt that his cycling ability was developed in South Africa. He was described as a "rough diamond" by Sky Principle Dave Brailsford when he joined the team, that diamond was shaped and polished by the scientific training techniques of the Sky Procycling team.
Another encouraging sign is the MTN Qhubeka team that encourages transformation and development and supports the World Cycling Center Africa to encourage African riders to rise up the ranks of the cycling world. They have an initiative to supply under privileged communities with bikes which also encourages planting trees and recycling.
All these things bode well for South African and African cycling in the future, hopefully in the near future we will see a South African wearing the yellow jersey on the Champs-Elysees on the final day of the Tour de France.