Did that from the get go calc's were are all over the place. Romic & Turner agreed on the 600lb. but as mentioned it is too soft.norcosam said:
I'd go 650# first, but I like it active.keen said:Did that from the get go calc's were are all over the place. Romic & Turner agreed on the 600lb. but as mentioned it is too soft.
I was going to mention this too.norcosam said:I would try 650lb.
How old is the shock does it need servicing or re-working for you and the bike,i hated my romic shock i had on one of my bikes.Exactly for the reason your having.It blew travel even with a harder spring it always lacked compression damping through the stroke.
Keen this is a somewhat rough estimate, but pretty close.keen said:Does anyone know how much preload affects the spring rate number ? Thanks.
It's a new Romic (old stock). I originally wanted a Roco TST but funds are tight - I knew it wouldn't be a 100% performer. The coil is much smoother than the air but dealing w/ getting the right spring will cost more than the shock itself.derby said:Keen this is a somewhat rough estimate, but pretty close.
Adding 2 turns preload does about the same as adding 10% or 60# more to your 600# spring rate, or like going to a 650# spring with nearly no preload. (On Fox shocks 18 to 20 preload turns = 1 inch. So 2 turns increase is about 2/20 or 10% of 600# resulting in about 60# increase.)
Preload affects sag height more than bottom out resistance, because the spring rate remains the same. A firmer spring compounds that rate increase progressively deeper in travel. However, when adding preload sag is raised, so your weight center is shifted forward, and then there's then less rate of weight on the spring throughout travel to bottom travel. So it feels like adding preload 2 turns raising sag does affect bottom travel about as much as going to a 10% firmer spring without changing sag and weight center.
Adding to the rough estimate is that springs vary as much as 5% or more in accuracy.