Fork Oil capacity with Progressive Fork Springs

Dean0

.060 Over
Joined
Nov 1, 2010
Messages
107
Location
Hindmarsh Tiers, SA
Ride
2012 R3T, 2014 R3R
Decided to upgrade the fork springs on my Roadster and with Progressive (the brand)

What is the fork oil capacity?.. concidering the Progressive's have more coils than the standard type.
 

9Ball

Supercharged
Joined
Jul 9, 2007
Messages
414
Location
South Jersey
Ride
2007 Rocket 3 Standard
Decided to upgrade the fork springs on my Roadster and with Progressive (the brand)

What is the fork oil capacity?.. concidering the Progressive's have more coils than the standard type.
I have these on my Valkyrie...typical recommendation from Valk owners is 1 to 2 oz less oil than specs call for. Don’t go too far up on the viscosity...keep it near recommended weight or else the front end will be too stiff and the benefit of the progressive suspension will be minimized.

My 2 cents...you can always call progressive technical service for best recommendation.
 

TURBO200R4

stand up straight and grab the world by the a$$
Joined
Jan 24, 2013
Messages
5,100
Location
TUCSON AZ
Ride
07 rocket III classic
I do not know touring
but based on the small amount of oil that goes into the forks i would think that it would not be much less..
measure the oil and see what i mean.
 

Journeyman28778

"And this one is just right" ~ Goldilocks
Joined
Aug 13, 2017
Messages
644
Location
Swannanoa, NC 28778 USA
Ride
'11 Rocket III Roadster
Decided to upgrade the fork springs on my Roadster and with Progressive (the brand)

What is the fork oil capacity?.. concidering the Progressive's have more coils than the standard type.
@Dean0 I'm about to put progressive springs in my Roadster and was also wondering the same thing. The Progressive springs will have more volume causing the resulting air space to be reduced if using the standard amount of oil. What did you find out?

@BillB mentions this in a post here about an R3T (Touring progressive fork spring upgrade)

"Book says air gap of 110mm. Instructions from Progressive sez nay. They say 140mm is absolute minimum air gap due to the spring design displacing more oil. I tend to think that the spring instructions over rule the manual in this case."

The 30mm difference is about an inch, which seems pretty significant.

I can't find anything on the Progressive site about this. Maybe it will be included with the springs when they come? If not, wondering if it's a different spec for the Roadster.
 
Last edited:

sonny

Living Legend
Joined
Sep 24, 2015
Messages
7,416
Location
Henryetta Oklahoma
Ride
rocket three x
I have the progressive springs and filled the forks as recommended per manual. Even have the ridicules special tool recommended per manual for this job. IMG_0461 (2).JPG Running this for fork oil and have no complaints at all. Very smooth and responsive.:D:D:D:D:D
 

Journeyman28778

"And this one is just right" ~ Goldilocks
Joined
Aug 13, 2017
Messages
644
Location
Swannanoa, NC 28778 USA
Ride
'11 Rocket III Roadster
I have the progressive springs and filled the forks as recommended per manual. Even have the ridicules special tool recommended per manual for this job. View attachment 65786 Running this for fork oil and have no complaints at all. Very smooth and responsive.:D:D:D:D:D
Thanks @sonny. I was also thinking of going with 7W and will do so based on your recommendation.
 

barbagris

Mad Scientist
Joined
Aug 1, 2010
Messages
12,717
Location
On the verge of insanity
Ride
2009 R3-Standard - 1979 Guzzi V1000G5
140mm airgap is the absolute maximum airgap independent of the spring. Any decent suspension guy CAN calculate this. But ime - even with the correct springs (to gain correct static and dynamic sag) 110 is too small.

The stock springs are WEAK so you gain some air-spring by reducing to 110mm. But if you have the sag set correctly 125-130 seems about right. I run 120 at the moment with Maxton cartridges and springs - I have "lost" about 10mm of suspension travel. But I am happy to do so.
 

BillB

Turbocharged
Joined
Sep 4, 2013
Messages
888
Location
Raleigh NC
Ride
2013 R3T, 1960 Franken-Pan
@Dean0 I'm about to put progressive springs in my Roadster and was also wondering the same thing. The Progressive springs will have more volume causing the resulting air space to be reduced if using the standard amount of oil. What did you find out?

@BillB mentions this in a post here about an R3T (Touring progressive fork spring upgrade)

"Book says air gap of 110mm. Instructions from Progressive sez nay. They say 140mm is absolute minimum air gap due to the spring design displacing more oil. I tend to think that the spring instructions over rule the manual in this case."

The 30mm difference is about an inch, which seems pretty significant.

I can't find anything on the Progressive site about this. Maybe it will be included with the springs when they come? If not, wondering if it's a different spec for the Roadster.
I went ahead and followed the instructions that came with the springs and set the air gap to 140mm and it worked like a charm. Once the forks were back on and the springs were in the tubes the oil level was quite high in the tube. Another 30mm of oil would have had the tubes almost full with the springs in them. Based on my experience with the R3T I would go with the information that comes with the springs.
 

Dean0

.060 Over
Joined
Nov 1, 2010
Messages
107
Location
Hindmarsh Tiers, SA
Ride
2012 R3T, 2014 R3R
@Dean0 I'm about to put progressive springs in my Roadster and was also wondering the same thing. The Progressive springs will have more volume causing the resulting air space to be reduced if using the standard amount of oil. What did you find out?

@BillB mentions this in a post here about an R3T (Touring progressive fork spring upgrade)

"Book says air gap of 110mm. Instructions from Progressive sez nay. They say 140mm is absolute minimum air gap due to the spring design displacing more oil. I tend to think that the spring instructions over rule the manual in this case."

The 30mm difference is about an inch, which seems pretty significant.

I can't find anything on the Progressive site about this. Maybe it will be included with the springs when they come? If not, wondering if it's a different spec for the Roadster.
I ended up using 10W with an air gap of 110mm on the roadster... stiffened up the front end nicely.

As for the Touring, I went with the standard 10W and an air gap of 140mm as per instructions that came with the springs.
 
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