Shock pressure for heavy rider

[droo]

Sheesh. Note to self - do not poke the bear.

 

Appreciate the defense though, thanks guys. Next round's on me.

[matthieup]

wow....

 

ok so I opened a can of worms here...

thanks for all the contributions. i think it is all well to follow some recommendations, but in my case I will make a turn to @droo

 

I believe being on the heavy side and having spent a lot of money on a bike it deserves a professional setup. To me it is simple. If the shocks are not set right, either they get damaged or the extra mechanical stress is transferred to the frame. In both cases i loose...

[Hairy]

Sheesh. Note to self - do not poke the bear.

 

Appreciate the defense though, thanks guys. Next round's on me.

now you are buying people with offers of a free round ..... ps ..... expect me to pop in soon

[droo]

now you are buying people with offers of a free round ..... ps ..... expect me to pop in soon

 

Been a while, but good to know bribery works.

 

Disclaimer: the round is only free cos I'm not legally allowed to sell beer. Promotional use only. Ts and Cs apply. 

[Eddy Gordo]

hahahaha, I missed it today. 

[dasilvarsa]

This is the instructions from Fox

This procedure I've used in the past successfully. 1kg=2.2 lbs 

It works if you have a good command of the English Language, Own a Shock Pump and are willing to go the extra mile

 

To achieve the best performance from your FOX suspension, adjust the air pressure to

attain your proper sag setting. Sag is the amount your suspension compresses under

your weight and riding gear. Sag range should be set to 25–30%

of total shock travel

.

Watch the sag setup video at

ridefox.com/sagsetup

1.

Turn the 3-position lever to the OPEN mode.

2.

Start by setting the shock air pressure (psi) to match your

weight in pounds. With the air pump attached to the shock

valve, slowly cycle your shock through 25% of its travel 10

times as you reach your desired pressure. This will equalize

the positive and negative air chambers and will change the

pressure on the pump gauge.

Do not exceed maximum air pressure:

Non-EVOL air shocks have a maximum pressure of 300psi.

EVOL air shocks have a maximum pressure of 350psi.

3.

Remove the pump.

4.

Sit still on the bike in your normal riding position, using a wall or a tree for support.

5.

Pull the sag indicator o-ring up against the rubber air sleeve seal.

6.

Carefully dismount the bike without bouncing.

7. Measure the distance between the sag indicator o-ring and the rubber air sleeve

seal. Compare your measurement to the ‘Suggested Sag Measurements’ table.

8.

Add or remove air pressure until you reach your desired sag measurement.

 

 

Fox Agrees with Me. You guys don't. I agree with Fox.

As for the Flaming I'm too old and experienced and thick skinned to actually worry about It.

Cheers

[Christofison]

This is the instructions from Fox

This procedure I've used in the past successfully. 1kg=2.2 lbs

It works if you have a good command of the English Language, Own a Shock Pump and are willing to go the extra mile

To achieve the best performance from your FOX suspension, adjust the air pressure to

attain your proper sag setting. Sag is the amount your suspension compresses under

your weight and riding gear. Sag range should be set to 25–30%

of total shock travel

.

Watch the sag setup video at

ridefox.com/sagsetup

1.

Turn the 3-position lever to the OPEN mode.

2.

Start by setting the shock air pressure (psi) to match your

weight in pounds. With the air pump attached to the shock

valve, slowly cycle your shock through 25% of its travel 10

times as you reach your desired pressure. This will equalize

the positive and negative air chambers and will change the

pressure on the pump gauge.

Do not exceed maximum air pressure:

Non-EVOL air shocks have a maximum pressure of 300psi.

EVOL air shocks have a maximum pressure of 350psi.

3.

Remove the pump.

4.

Sit still on the bike in your normal riding position, using a wall or a tree for support.

5.

Pull the sag indicator o-ring up against the rubber air sleeve seal.

6.

Carefully dismount the bike without bouncing.

7. Measure the distance between the sag indicator o-ring and the rubber air sleeve

seal. Compare your measurement to the ‘Suggested Sag Measurements’ table.

8.

Add or remove air pressure until you reach your desired sag measurement.

 

Fox Agrees with Me. You guys don't. I agree with Fox.

As for the Flaming I'm too old and experienced and thick skinned to actually worry about It.

Cheers

Nothing here says "shock psi = double weight in kg".

[RiverInTheRoad]

Pounds are roughly 2x your weight in kg's. Dasilva is rude but his advice was sound IMO.

[Deepblue1993]

 

This is the instructions from Fox

This procedure I've used in the past successfully. 1kg=2.2 lbs 

It works if you have a good command of the English Language, Own a Shock Pump and are willing to go the extra mile

 

To achieve the best performance from your FOX suspension, adjust the air pressure to

attain your proper sag setting. Sag is the amount your suspension compresses under

your weight and riding gear. Sag range should be set to 25–30%

of total shock travel

.

Watch the sag setup video at

ridefox.com/sagsetup

1.

Turn the 3-position lever to the OPEN mode.

2.

Start by setting the shock air pressure (psi) to match your

weight in pounds. With the air pump attached to the shock

valve, slowly cycle your shock through 25% of its travel 10

times as you reach your desired pressure. This will equalize

the positive and negative air chambers and will change the

pressure on the pump gauge.

Do not exceed maximum air pressure:

Non-EVOL air shocks have a maximum pressure of 300psi.

EVOL air shocks have a maximum pressure of 350psi.

3.

Remove the pump.

4.

Sit still on the bike in your normal riding position, using a wall or a tree for support.

5.

Pull the sag indicator o-ring up against the rubber air sleeve seal.

6.

Carefully dismount the bike without bouncing.

7. Measure the distance between the sag indicator o-ring and the rubber air sleeve

seal. Compare your measurement to the ‘Suggested Sag Measurements’ table.

8.

Add or remove air pressure until you reach your desired sag measurement.

 

 

Fox Agrees with Me. You guys don't. I agree with Fox.

As for the Flaming I'm too old and experienced and thick skinned to actually worry about It.

Cheers

 

I also consulted the Fox site, using my serial number on the shock and followed instructions. I did not know about cycling to fill positive and negative air chambers. I did a couple of times as instructed, then measured the sag in mm with kit and hydration pack. Added air until I was happy with my sag reading and to finish off I did the "curb test" to set my rebound. The complete process was about half an hour, but worth it. 

[Captain Fastbastard Mayhem]

Pounds are roughly 2x your weight in kg's. Dasilva is rude but his advice was sound IMO.

That's not how this works. Weight is not calculated at pounds per square inch.

 

Your initial statement is correct, but your conclusion is not.

[Jehosefat]

That's not how this works. Weight is not calculated at pounds per square inch.

 

Your initial statement is correct, but your conclusion is not.

Weight is not calculated in PSI however the extract from the Fox instructions does say to set the pressure in PSI equal to the rider weight in lbs as a starting point. So I don't think anyone was suggesting that weight was measured in PSI...

 

And 1kg = 2.2lbs so "double your weight" is a reasonable estimate for a starting point based on the instructions from Fox.

 

Obviously how far you have to tweak it from there will depend on riding style, suspension leverage etc etc etc.

[droo]

 

This is the instructions from Fox

This procedure I've used in the past successfully. 1kg=2.2 lbs 

It works if you have a good command of the English Language, Own a Shock Pump and are willing to go the extra mile

 

To achieve the best performance from your FOX suspension, adjust the air pressure to

attain your proper sag setting. Sag is the amount your suspension compresses under

your weight and riding gear. Sag range should be set to 25–30%

of total shock travel

.

Watch the sag setup video at

ridefox.com/sagsetup

1.

Turn the 3-position lever to the OPEN mode.

2.

Start by setting the shock air pressure (psi) to match your

weight in pounds. With the air pump attached to the shock

valve, slowly cycle your shock through 25% of its travel 10

times as you reach your desired pressure. This will equalize

the positive and negative air chambers and will change the

pressure on the pump gauge.

Do not exceed maximum air pressure:

Non-EVOL air shocks have a maximum pressure of 300psi.

EVOL air shocks have a maximum pressure of 350psi.

3.

Remove the pump.

4.

Sit still on the bike in your normal riding position, using a wall or a tree for support.

5.

Pull the sag indicator o-ring up against the rubber air sleeve seal.

6.

Carefully dismount the bike without bouncing.

7. Measure the distance between the sag indicator o-ring and the rubber air sleeve

seal. Compare your measurement to the ‘Suggested Sag Measurements’ table.

8.

Add or remove air pressure until you reach your desired sag measurement.

 

 

Fox Agrees with Me. You guys don't. I agree with Fox.

As for the Flaming I'm too old and experienced and thick skinned to actually worry about It.

Cheers

 

 

If you'd said it like that at the beginning, nobody would be arguing with you. Your original statement was incorrect, and I corrected it. The complete version, as you have posted here, I cannot fault.

[Eddy Gordo]

http://www.ridefox.com/dl/bike/605-00-164-FLOAT-DPS-Tuning-Guide-white-revA.pdf

 

Ballpark 

 

Your body weight in PSI (fork)

Twice your body weight in PSI (Shock)

 

Body weight is in Kg 1Kg=1PSI

 

Add +- 5 psi that will escape when you remove the pump.

 

This is very different to what you last said and quoted from fox

Edited January 18, 2018 by Eddy Gordo