In yet another effort to get people out of their cars, San Francisco is gearing up to install a record 100 new bikes racks a month in the coming year. How quickly the new racks fill up, however, remains to be seen.

“Cyclists are frustrated,” Supervisor Rafael Mandelman said. “We have seen rack after rack for rental bikes and scooters being installed, but there are still places that have no place for a regular bike to park.”

Brian Wiedenmeier, executive director of the politically powerful, 10,000-member San Francisco Bicycle Coalition, agreed.

“More bike racks will lead to more people biking,” Wiedenmeier said.

But if recent history is any indication, Weidenmeier’s “if you build it, they will come” thesis may be an iffy bet.

Just look at the numbers:

More than 106 miles of bike lanes were installed in the city between 2006 and 2018. And in the past five years, the city has added 2,676 bike racks.

But despite the efforts to make pedaling to work faster, easier and safer, bike ridership has remained pretty much static.

According to San Francisco Municipal Transit Agency’s annual count, bike use, as compared to all trips taken in the city, has hovered between a high of 4.4 % in 2014 and a low of 3.1% in 2017.

Bike use rose to 4.2% in 2018, accounting for about 22,000 commuter trips a day.

“That is a 20% increase,” Wiedenmeier said. He speculated that the increase could be attributed to the increase in bike paths and bike share companies in the city.

By comparison, the number of San Franciscans traveling in taxis, motorcycles, Lyfts and Ubers stayed between 61% and 65% — 6 out of 10 trips — according to the SFMTA’s 2018 transit trend report.

Mass transit represented about a third of the trips taken in 2018.

“There was a bit of uptick in bike use 2018, but it was off of what I would describe as a comparatively low baseline,” said Metropolitan Transportation Commission spokesman John Goodwin.

And it’s not just in San Francisco.

“When you focus on commute trips, patterns have been pretty static all around the Bay Area,” Goodwin added.

And while bicycling to work still needs work, recreational and tourist biking appears to be doing just fine.

The heaviest traveled route in the city wasn’t along any of the main commuter corridors, but rather the tourist heavy, waterfront Marina Bike Path, where more than 1 million bikes were recorded at key intersections in the 2018 MTA count. So, there’s hope the trend will continue.

And with that in mind, the city is set to spend $90 million for another 42 miles of bike paths over the next three years, with 2,250 new bike racks as well.

“There’s a real need for those racks,” Mandleman said.

Let’s hope so.

Home field advantage? Former Vice President Joe Biden and Massachusetts Sen. Elizabeth Warren lead the pack of Democratic presidential hopefuls in California with 24% and 23% support, respectively, according to a recent Public Policy Institute poll.

Vermont Sen. Bernie Sanders clocked in at third with 17% support — followed by California Sen. Kamala Harris at 8%, South Bend, Ind., Mayor Pete Buttigieg at 7% and entrepreneur Andrew Yang at 5%.

No other candidate scored more than 1%, while 9% of those surveyed said they don’t know which candidate they would choose.

The California primary is in March.

San Francisco political alum Harris, who got her start as the city’s district attorney and was seen by insiders as the home- state favorite, comes in with less than 10% support even in the Bay Area.

“Not only does she not have a home-state advantage, she doesn’t have a local advantage, either,” said chief PPIC pollster Mark Baldassare. “It’s been a while since her big rally in Oakland,” Baldassare said, referring to Harris’s campaign kick off in January that drew a crowd estimated at 20,000.

The poll of 608 likely Democratic voters was taken on Nov. 3 through Nov. 12 and has a margin of error of plus or minus 5 percentage points.

A closer look at the cross tabs shows that Biden is the top pick with voters 45 and older, Warren is the top choice with the 18- to 44-year-old crowd.

“The Democratic presidential primary remains in a fluid state, with most likely voters saying they want the candidate who seems most likely to defeat Donald Trump,” Baldassare said.

San Francisco Chronicle columnist Phil Matier appears Sundays and Wednesdays. Matier can be seen on the KGO-TV morning and evening news and can also be heard on KCBS radio Monday through Friday at 7:50 a.m. and 5:50 p.m. Got a tip? Call 415-777-8815, or email pmatier@sfchronicle.com. Twitter: @philmatier