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Replacement Parts Specifications
model years of the Rialta use the same shock for the front and the same shock
for the rear axle. The OEM brand used for both the front and rear shock absorbers
is Bilstein. You can find Bilstein shocks available from a large number of retail
automotive sources and a multitude of online companies.
Fortunately, Monroe has recently decided to add a product
to their line that fits the Rialta motorhome. In 2004 they introduced their
Gas Magnum RV shock absorber line and the pricing structure undercuts Bilstein
by about half. You need to check prices from several sources as there seems
to be quite a variance.
Special Note: All of the REAR shocks shown are considered obsolete by the
manufacturers. If you find a suitable substitute, please let me know. The original Bilteins
can be rebuilt, but there's a 10 week or so lead time.
||7D0 413 031C
Bilstein's RV Shock Application
Shock Application Guide (On-Line Look-Up Only)
Shock Absorber Mounting Styles (PDF)
Shock Absorber Dimension Charts (PDF)
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Surprisingly, the front shock absorber on the Rialta is the
same as comes from the factory for the EuroVan camper. In other words, the front
shocks on the Rialta are not any bigger or heavier duty than those on the EVC.
Replacing the shocks are straightforward and anybody with the simplest of knowledge
and tools can effect replacement.
The original shock for the front axle of a Rialta is a Bilstein
"B46-1911" (new p/n 24-019118) which is a mono tube gas charged design. You probably won't find
this part number in stock at any dealer because of its limited use. There is at
least one other brand name available and that is Monroe.
Bilstein warrants their
after-market shocks for life but this warranty does not apply to the original
Some prevalent online sources for Bilstein and Monroe shocks include
eshocks.com (which also provides
free shipping from their location in Michigan if your order is more than $200),
and others. Or you can try any other automotive parts store or tire/shock dealer
but even if they show the part in their inventory system, it most likely will
have to be special ordered.
You probably could order this shock through the VW dealership or a Winnebago
dealership but be prepared to pay more. One recent price quote
from a VW dealer was nearly $200 for each shock. And these prices are not installed.
Bilstein does offer a service to rebuild your old worn out Bilstein shocks
for a flat fee, but you would have to pay shipping to their Poway, California facility
and new mounting hardware such as hex nuts and washers is not included. Bilstein
shocks are normally warranted for life except the OEM shocks that came with the
vehicle are only warranted by the vehicle manufacturer, in this case, Winnebago.
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All years and all models of Rialta use the same identical rear
shock absorber. The rear shock is NOT the same as found on standard EuroVans or
EuroVan Campers. It appears that this shock is a single application part which
seems to fit only the Winnebago Rialta.
The correct shock for the rear axle of a Rialta is a Bilstein
"F4-B46-1830M1" (new p/n 24-018302) which is a mono tube gas charged design. You probably won't find
this part number in stock at any dealer and to my knowledge there is no direct
interchange with any other brand so you are forced to stay with the
Bilstein brand, though Monroe is
rumored to have a replacement, p/n 555041. The good
news is that Bilstein warrants
their after-market shocks for life.
One prevalent source of supply for these shocks is
is located in southern California. Another on-line source is
eshocks.com which also provides
free shipping from their location in Michigan if your order is more than $200. Or
you can try any other automotive parts store or tire/shock dealer but even if
they show the part in their inventory system, it most likely will have to be special
You probably could order this shock through the a Winnebago dealership but be prepared to pay more.
Bilstein does offer a service to rebuild your old worn out
Bilstein shocks for a flat fee, but you would have to pay shipping to their Poway,
California facility and new mounting hardware such as hex nuts and washers is
not included. Bilstein shocks are normally warranted for life except the OEM shocks
that came with the vehicle are only warranted by the vehicle manufacturer, in
this case, Winnebago.
in this photo is the new Monroe shock that I installed to replace the original
Bilstein. The Monroe was less than half the price of the Bilstein and performance
has proven to be the same or better than the Bilstein. When I bench-tested both
of them, the rebound rate on the Monroe was much slower than the Bilstein. Compression
force seemed to be equal so one is not any "stiffer" riding than the other. All
other things being equal, I would easily recommend the Monroe over the Bilstein.
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Rear Air Springs
These are often mistakenly called "air shocks" but technically
they should be called "air springs" as they mount between the rear leaf springs
and the body. They assist in leveling the body when the rear axle is heavily loaded.
An additional side benefit is that each air bladder can be independently inflated
to allow for a variance in loading from side to side, thus correcting any body
The set of two air springs is supplied by "3-T's RV Products
Inc." located at 1055 Empire Drive in Lake Havasu City, Arizona. The model
used on the Rialta is the Model T-9V made specifically for what they call the
"Rialta H-Body". They have a repair kit available that includes both bags
and all lines and fittings for about $270 as of November 2017.
Give them a call at 800-223-1779 or 928-453-3040.
With a new Rialta you should find the warranty and product
information in the black info-case that came from Winnebago. Inside of the package
about these rear air springs, you'll probably find two silver stickers that Winnebago
does not affix to the body near the air valve for inflation. The stickers give
the name, address and phone number of the manufacturer along with the inflation
figures which call for a minimum of 20 PSI and a maximum of 100 PSI. Be careful
when inflating as it only take a small puff of air to change the pressure in these
relatively small air bladders.
is not much you can do in terms of maintenance. The air bladder inside either
holds air or it doesn't. But you can check a few things. First, make sure you
never drive around with the bladder totally deflated as shown in this picture
shown on the left. A minimum pressure of 20 PSI is required at all times.
because the mounting hardware is a regular grade steel and neither it nor the
bolts and nuts have any sort of anti-corrosion protection, you may wish to consider
removing the entire assembly for thorough cleaning. This will allow you to bench
clean all the steel parts and checks for any tears or punctures in the protective
outer boot. You can then sand down any minor rust on the mounting hardware and
give a good coat of paint. When you re-install the device make sure you mount
back into the same exact position. Usually it will leave a "shadow" of either
dirt or corrosion to mark the exact spot but you should probably use a yellow
pencil to mark the spots ahead of time. Also make sure the the top and bottom
pieces are mounted directly in line with each other. The original installation
from Winnebago may have been done haphazardly so your original mounting marks may
need to move in order to obtain proper installation.
The direct replacements for the bags are the Firestone Airide Replacement Air Spring - w02-358-7046 found
You can also use the 1S4-123 Goodyear Air Spring found
but the mounting bolt is a bit shorter.
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