Details Our 2023 TRL bikes start with longer 21” and 21.25” top-tube trail geometry frames with chain-stay mounted brakes. Traditional 33mm offset forks pair perfectly with the stable 74.5-degree TRL head-angle. Other notable features on 2023 TRL’s include double walled FIT OEM rear rims, female front axles, S&M Shield railed seats and 300 mm micro adjust seat posts. Traditional 33mm offset forks pair perfectly with the stable 74.5-degree TRL head-angle. Other notable features on 2023 TRL’s include double walled FIT OEM rear rims, female front axles, S&M Shield railed seats and 300 mm micro adjust seat posts.