Maven's march continues, announcing on Tuesday it would partner with Uber, allowing drivers to rent General Motors vehicles on a weekly basis.

The three-month pilot project is somewhat surprising considering Maven has already made considerable inroads with Lyft--Uber's chief North American rival-in March of this year GM and Lyft announced the $500 million Express Drive program.

According to Rachel Holt, Uber's regional general manager for North America and Canada, the cost per week is $179 plus taxes and fees, with no extra fees if cars are used for personal reasons. At launch the service will only operate in San Francisco.

Julia Steyn, GM's vice president of urban mobility, told Automotive News the pricing for Uber drivers was on par with what Lyft drivers pay.

GM has been a pioneer investing in the ride sharing space as a hedge against eventual declines in private vehicle ownership.