July 16, 20251 yr I'm new here and have just bought a used 2019 Vertigo Combat Vertical 250cc. I'm about to change the oil in both front forks, but I'm a bit unsure about the correct oil level. In the service manual for the bike, it says the oil level should be 130 mm in both forks. However, in the service manual for the forks — which are Tech Suspension — it states that the level should be 130 mm in the left fork and 75 mm in the right. Which one should I trust?
July 16, 20251 yr @Seabag this matches the service manual you have so looks like you have the answer. https://vertigomotors.co.uk/technical/
July 16, 20251 yr Short answer: probably Tech. The left side has the wire spring, so a lower fluid level tends to compensate and gives a similar air chamber volume as a higher level without a spring. But ultimately, those numbers are just a starting point. The fluid level affects the bottoming behavior. Different riders may require/prefer different settings. It's easier to add oil (using a syringe) than to remove it. More info here: https://www.electricmotiontech.com/home/em-epure-race/mechanicals/tech-39mm-forks
July 16, 20251 yr @ Seabag https://blog.splatshop.co.uk/tech-suspension-fork-oil-levels/ IPONE oil 3WT for = to FORMULA recommended OJ01 FORK OIL . as stated in the blog.
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