Hi yall, if you have had any experience or know anything of the Suntour shifters I would greatly appreciate hearing what it is you know. I'm looking at a used 2300 trek older model. I think it originally came with Shimano 600 Ultegra STI but now has 12speed downtube Suntour shifters (indexed, Accushift) Fr Der - Campagnolo. Are these any good? Thank you so much guys!