5 weight oil replacing 7.5?

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This topic has 13 replies, 10 voices, and was last updated 10 years ago by welshfarmer.

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5 weight oil replacing 7.5?
seanodav
Free Member

Will it make any difference in an open bath 55 rc3 ti, if so by much?

Posted 10 years ago

LoCo
Free Member

less rebound less compression

Posted 10 years ago

seanodav
Free Member

thanks simon, im guessing being 9.5 stone and using no compression this wont matter? only reason is i can get 5 weight easily as apposed to having to order 7.5

Posted 10 years ago

FGF 701 The Hydrate Or Die Edition

riddoch
Full Member

Apparently there isn’t a standard for oil weight, so one brands 5w could be as viscous as another’s 7.5w.

Posted 10 years ago

poah
Free Member

depends on the viscosity index of the oil. some 7.5wt oils are as thin as 5wt

http://img.docstoccdn.com/thumb/orig/9216346.png

Posted 10 years ago

seanodav
Free Member

minefield… so dump it in and adjust compression/rebound to suit. 😀

Posted 10 years ago

molgrips
Free Member

If you can dial the damping up a bit, then it’ll be fine obv.

If you are already on max compression then no.

Posted 10 years ago

bigjim
Full Member

I’ve used this since reading into this stuff here and on mtbr. Fox 10w is heavier than some 15w for example

http://www.peterverdone.com/wiki/index.php?title=Suspension_Fluid

Posted 10 years ago

welshfarmer
Full Member

I approached my local Motocross race team to buy some fork oil and they only had 10wt and 5wt. Apparently if they need 7.5 they just mix 5wt & 10wt 50:50. ❓

Posted 10 years ago

seanodav
Free Member

great, thanks for help folks.

Posted 10 years ago

chiefgrooveguru
Full Member

I’ve been thinking about putting a heavier weight (or higher viscosity) oil in my open bath Floats to give them more compression damping (I can then turn the rebound damping down a bit).

Posted 10 years ago

wysiwyg
Free Member

Maxima racing 7 weight fork oil has v similar sae and what I use in all my zocchis. Not too dear either.

Posted 10 years ago

bigyinn
Free Member

welshfarmer – Member

I approached my local Motocross race team to buy some fork oil and they only had 10wt and 5wt. Apparently if they need 7.5 they just mix 5wt & 10wt 50:50.
Apparently that will get you close, but it isnt quite that simple. I think its something like 2/3 10wt to 1/3 5wt to get 7.5.
That peterverdone link is quite useful.

Posted 10 years ago

welshfarmer
Full Member

The 50:50 was my assumption to be fair. They just said that they mix the 2 weights to get the other weight. They probably know what they are doing being one of the big Motocross teams on the UK circuit

Posted 10 years ago