Brisbane City Council will double the number of motorcycle parking spaces in the CBD but has no plans to give a community car-sharing service any spaces.
The council will increase the number of dedicated motorcycle and moped spaces from 230 to 450 on July 28 in response to growing demand.
It will also spend $1.2 million over the next two years setting up a bicycle hire scheme around Brisbane.
But Deputy Mayor and infrastructure chairperson Graham Quirk ruled out allocating any car spaces to GWhiz Carshare, whose 80 members share six cars.
The decision means GWhiz must continue to pay, on average, one parking fine per month as well as rely on the generosity of local businesses to park its vehicles in inner-city streets.
Councils in both Sydney and Melbourne have donated dedicated spaces to car sharing companies to encourage green-mindedness.
GWhiz managing director Emma-Kate Rose said Brisbane's resistance had "significantly hampered our growth".
Gwhiz members share driving privileges for a fleet of six cars stationed in West End, South Brisbane and Fortitude Valley.
Members can book a Toyota Yaris, Mini Cooper or Ford station wagon at any time of the day or night, over the internet or by phone, for quick trips or weekends away.
The car is picked up and returned to the same place, which means the business must put each vehicle in a safe and accessible location.
Of its six spaces, GWhiz pays $80 per month to rent a space in a dental practice car park, $190 per month for a McWhirters car park in Fortitude Valley, and the odd parking fine to leave two cars in West End.
A Fortitude Valley business has also donated one of its spaces to a GWhiz car in return for naming rights.
Ms Rose said Queensland Rail had recently agreed to have one of the cars park at South Brisbane railway station.
Cr Quirk said the business did not make a big enough impact on vehicle numbers to warrant any donation of car parking spaces.
"Kerbside space is at a premium and we don't see it as having a significant impact in terms of the issue of traffic, therefore we haven't really engaged in it," he said.
The council was also reluctant to support a private company, he said.
"Obviously we encourage them but there's a difference between that and making public space available to a private company."
Sydney City Council has recently handed over 12 dedicated on-road spaces to three different private services as part of a car sharing trial.
Ms Rose said she hoped the council would change its position in future.
"I really see a big benefit in combining different transport modes, so co-locating bicycle parking, motorbike parking and car-share parking close to public transport stops," she said.
"It would really make things a lot easier for your average commuter to make a really good decision to be less dependent on the car."