The pair have created a 21-minute buffer over second-placed Alan Gordon and Timothy Hammond of Insect Science going into the 122km fifth stage tomorrow.
They won today’s stage by a comfortable eight-minute margin. Bell said they got away early on in the 93km stage.
“It was fun today on the trails but it was still hard going,” Bell said. “We [Combrinck and him] rode away just before the ‘great wall my china’, about 20km in.
“We stuck with the solo guys and we kept it going until the end,” he added, with solo riders Matthys Beukes and Phillemon Sebona finishing first and second overall respectively.
Bell said he was satisfied with the lead they had established ahead of the final four stages.
“We are glad to have some time over our competitors with some hard stages ahead.
“Tomorrow’s stage will be very long and hard, but we are just getting closer to the sea and that is always a good thing.”
View the results here.