The staff at Helen's Cycles are very knowledgeable folks who can help you resolve your biking problems and needs whether it's a new bike seat, gloves, sun glasses, or clothing, they have it all. You can purchase products and get your biked equiped with all your new gadgets while you wait. Biking stuff can get expensive, you look out for clearance sales and gently used products in the store.
There are several stores in LA including in Westwood, Santa Monica, Venice, and Manhattan Beach.
Oh, they also give discounts if you are doing a race for a charity.
On a customer service note, I think they were great. I returned a bike pump months after I purchased it from a different store location, without the receipt. The pump was fine, except i found my old pump and didn't feel I needed two of them. They gladly took it back and gave me a store refund, which helped me out when I purchased a new helmet.