LOS ANGELES (Reuter) - The stock of snowboard maker Ride Inc. slid 25 percent after confusion broke out when the company told analysts its annual earnings would be concentrated in the second half rather than spread evenly. The analysts accordingly cut their first half estimates and applied them to the second half. However the changes sent the shares on a downhill slalom, even though the overall forecasts for 1996 were either unchanged or raised. The Preston, Wash.-based firm's stock fell $8.50 to $25, making it the biggest loser on the Nasdaq system. ``I'm amazed at the apparent level of panic,'' Ride Chairman Roger Madison said in an interview. Hambrecht & Quist analyst Shelly Young said the selling was overdone and she expected a partial retracement on Monday. After speaking to the company, she maintained her buy rating and her 1996 earnings estimate. Throughout the day, Madison called about half a dozen analysts to give them an update on their earnings models, telling them that costs were increasing as a result of increased manufacturing capacity and research spending. However gross margins were increasing too, he added. ``Our SG&A (Selling, General & Administrative costs) is becoming more fixed because of the fact that we acquired a manufacturing plant and because we're adding SG&A to support increased levels of sales that are happening,'' Madison said. ``A lot of that you incur in the first quarter even though the revenues don't come till the third and fourth quarters.'' Analysts had been a little optimistic about the company's ability to reduce the company's reliance on seasonal factors, he said. But he was very comfortable with the updated models. Madison is Ride's third biggest shareholder with about 550,000 shares. The biggest shareholder is Chief Executive Officer James Salter with 1.2 million shares. The company has about 10.5 million shares outstanding, he said Friday. 06:37 01-15-96