OP
UTC

Member
Vespa 125 g.t.r., Vespa P200E, Crescent Skoterett
Joined: UTC
Posts: 19
Location: Sweden
 
Member
Vespa 125 g.t.r., Vespa P200E, Crescent Skoterett
Joined: UTC
Posts: 19
Location: Sweden
UTC quote
I'm looking for at front suspension/spring upgrade for my GTR from 1974. What are the best options? I'm looking for better performance but nothing too expensive. I want to keep it as close to stock looking as possible. Any insights or experiences to share?
@l4nff avatar
UTC

Hooked
1972 Vespa GTR, 1963 Lambretta LI 125, Royal Alloy GP125
Joined: UTC
Posts: 225
Location: Halifax, England
 
Hooked
@l4nff avatar
1972 Vespa GTR, 1963 Lambretta LI 125, Royal Alloy GP125
Joined: UTC
Posts: 225
Location: Halifax, England
UTC quote
I'm interested in this post. My 72 GTR dives like crazy. I have a stiffer spring that standard and have tried a few different dampers. I'm currently using Forsa which is better than the Escort I was using. I see it as dreadful design and can not understand why it was ever made like it is to start with.
Anyone got any great simple mods to this problem?
@socalguy avatar
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bodgemaster
63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150
Joined: UTC
Posts: 7155
Location: So Cal
 
bodgemaster
@socalguy avatar
63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150
Joined: UTC
Posts: 7155
Location: So Cal
UTC quote
Look here:

Fronk shock
@rowdyc avatar
UTC

Molto Verboso
GL, PK, PE200 with hack, Sears Rust Badge
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Posts: 1346
Location: Deep in the heart of Texas
 
Molto Verboso
@rowdyc avatar
GL, PK, PE200 with hack, Sears Rust Badge
Joined: UTC
Posts: 1346
Location: Deep in the heart of Texas
UTC quote
These look stockish and reduces the diving a lot. I have the 60psi version and they work great. The price has gone up since my purchase. https://www.sip-scootershop.com/en/product/shock-absorber-sip-performance-front_78000FSM
Silver is out of stock but the black is available. https://www.sip-scootershop.com/en/product/shock-absorber-sip-performance-front_78000FBM
The silver 100psi is available but the higher the psi the quicker the rebound.
https://www.sip-scootershop.com/en/product/shock-absorber-sip-performance-front_78000FSL

There are many choices out there that are better then stock but these worked for me and still looks stockish.
OP
UTC

Member
Vespa 125 g.t.r., Vespa P200E, Crescent Skoterett
Joined: UTC
Posts: 19
Location: Sweden
 
Member
Vespa 125 g.t.r., Vespa P200E, Crescent Skoterett
Joined: UTC
Posts: 19
Location: Sweden
UTC quote
rowdyc wrote:
These look stockish and reduces the diving a lot. I have the 60psi version and they work great. The price has gone up since my purchase. https://www.sip-scootershop.com/en/product/shock-absorber-sip-performance-front_78000FSM
Silver is out of stock but the black is available. https://www.sip-scootershop.com/en/product/shock-absorber-sip-performance-front_78000FBM
The silver 100psi is available but the higher the psi the quicker the rebound.
https://www.sip-scootershop.com/en/product/shock-absorber-sip-performance-front_78000FSL

There are many choices out there that are better then stock but these worked for me and still looks stockish.
Thanks for the tip. Did you change the spring as well or just the shock abosorber?
UTC

Molto Verboso
1958 Allstate 177VMC, 1962 Allstate, Yamaha Vino 70cc
Joined: UTC
Posts: 1980
Location: Philadelphia
 
Molto Verboso
1958 Allstate 177VMC, 1962 Allstate, Yamaha Vino 70cc
Joined: UTC
Posts: 1980
Location: Philadelphia
UTC quote
rowdyc wrote:
These look stockish and reduces the diving a lot. I have the 60psi version and they work great. The price has gone up since my purchase. https://www.sip-scootershop.com/en/product/shock-absorber-sip-performance-front_78000FSM
Silver is out of stock but the black is available. https://www.sip-scootershop.com/en/product/shock-absorber-sip-performance-front_78000FBM
The silver 100psi is available but the higher the psi the quicker the rebound.
https://www.sip-scootershop.com/en/product/shock-absorber-sip-performance-front_78000FSL

There are many choices out there that are better then stock but these worked for me and still looks stockish.
holy cow I'm glad I bought the SIP shock back before the price went up!
UTC

Molto Verboso
1958 Allstate 177VMC, 1962 Allstate, Yamaha Vino 70cc
Joined: UTC
Posts: 1980
Location: Philadelphia
 
Molto Verboso
1958 Allstate 177VMC, 1962 Allstate, Yamaha Vino 70cc
Joined: UTC
Posts: 1980
Location: Philadelphia
UTC quote
LIJ wrote:
rowdyc wrote:
These look stockish and reduces the diving a lot. I have the 60psi version and they work great. The price has gone up since my purchase. https://www.sip-scootershop.com/en/product/shock-absorber-sip-performance-front_78000FSM
Silver is out of stock but the black is available. https://www.sip-scootershop.com/en/product/shock-absorber-sip-performance-front_78000FBM
The silver 100psi is available but the higher the psi the quicker the rebound.
https://www.sip-scootershop.com/en/product/shock-absorber-sip-performance-front_78000FSL

There are many choices out there that are better then stock but these worked for me and still looks stockish.
Thanks for the tip. Did you change the spring as well or just the shock abosorber?
I changed the spring and shock at the same time. I have yet to test it out though... so there's that
@rowdyc avatar
UTC

Molto Verboso
GL, PK, PE200 with hack, Sears Rust Badge
Joined: UTC
Posts: 1346
Location: Deep in the heart of Texas
 
Molto Verboso
@rowdyc avatar
GL, PK, PE200 with hack, Sears Rust Badge
Joined: UTC
Posts: 1346
Location: Deep in the heart of Texas
UTC quote
LIJ wrote:
rowdyc wrote:
These look stockish and reduces the diving a lot. I have the 60psi version and they work great. The price has gone up since my purchase. https://www.sip-scootershop.com/en/product/shock-absorber-sip-performance-front_78000FSM
Silver is out of stock but the black is available. https://www.sip-scootershop.com/en/product/shock-absorber-sip-performance-front_78000FBM
The silver 100psi is available but the higher the psi the quicker the rebound.
https://www.sip-scootershop.com/en/product/shock-absorber-sip-performance-front_78000FSL

There are many choices out there that are better then stock but these worked for me and still looks stockish.
Thanks for the tip. Did you change the spring as well or just the shock abosorber?
Nope. I kept the old 50 year old spring. If you think you want a spring, get the SIP upgrade vs the Stoffi. The Stoffi is just too stiff but great for an Allstate that has no shock.
@oopsclunkthud avatar
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Banned
3:5
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Location: San Francisco
 
Banned
@oopsclunkthud avatar
3:5
Joined: UTC
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Location: San Francisco
UTC quote
just my opinion:

short of changing the fork for a PK/Zip, there is no way to separate the suspension from the braking forces. It's a limitation in the design of a trailing link with the shoes mounted to the link.

The stock spring rate is good for absorbing bumps when not braking, but bottoms out when you apply the brake. So, while riding you can think of it as having suspension OR brakes, but never both at the same time.

An upgraded spring will suck when riding down the road, but can resist the braking force. so, while riding you can think of this as having nothing OR suspension + brakes, "Oh a bump is coming, I should apply the brakes to get the spring into a position where it can do something about it..."
OP
UTC

Member
Vespa 125 g.t.r., Vespa P200E, Crescent Skoterett
Joined: UTC
Posts: 19
Location: Sweden
 
Member
Vespa 125 g.t.r., Vespa P200E, Crescent Skoterett
Joined: UTC
Posts: 19
Location: Sweden
UTC quote
oopsclunkthud wrote:
So, while riding you can think of it as having suspension OR brakes, but never both at the same time.
A metaphor for life...
@gickspeed avatar
UTC

Ossessionato
Joined: UTC
Posts: 2164
Location: Racing Capital of the World
 
Ossessionato
@gickspeed avatar
Joined: UTC
Posts: 2164
Location: Racing Capital of the World
UTC quote
oopsclunkthud wrote:
just my opinion:

short of changing the fork for a PK/Zip, there is no way to separate the suspension from the braking forces. It's a limitation in the design of a trailing link with the shoes mounted to the link.

The stock spring rate is good for absorbing bumps when not braking, but bottoms out when you apply the brake. So, while riding you can think of it as having suspension OR brakes, but never both at the same time.

An upgraded spring will suck when riding down the road, but can resist the braking force. so, while riding you can think of this as having nothing OR suspension + brakes, "Oh a bump is coming, I should apply the brakes to get the spring into a position where it can do something about it..."
Very well said.

It always gets me back to saying "maybe this model is not for you." Once you wrap your head around the trailing link system and understand and respect what you are working with, then driving it is that much better.
@socalguy avatar
UTC

bodgemaster
63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150
Joined: UTC
Posts: 7155
Location: So Cal
 
bodgemaster
@socalguy avatar
63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150
Joined: UTC
Posts: 7155
Location: So Cal
UTC quote
Problem with the pre-P trailing link is there's virtually no preload to the front shock and thus no rebound dampening from the static position.
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