Fox Shox F80X 2003 Front Shocks

The F80X suspension fork is the pinnacle in technology for a racing cross-country mtn. bike suspension fork. The F80X damper with automatic intertia-vlave technology coupled with the F80 chassis makes this the ultimate XC racing fork. The F80 chassis used onthe F80RLT and F80X uses specially designed lightweight chassis and internal parts throughout the fork.

  • NEW Lightweight Chassis Parts:
    -Lightweight Optimized double-butted steerer made from Easton EA70 material
    -NEW forged 7075-T6 crown with external Scalloped machining and hollow Double-barrel machined internal features
    -Lightweight F80 specific Uppertubes made from Easton EA70 material
    -Lightweight Lower Leg with machined fork brace
  • NEW Lightweight Damper Parts
    -Polished Hard Anodized Aluminum Damper shafts made from Easton 7075-T6 material
    -Lightweight Rebound Adjuster Rod
    -Lightweight Hard Anodized Cartridge Damper Tube
  • NEW Lightweight Air Spring Parts:
    -Lightweight Air Shafts made from Easton 7075-T6 material
    -Lightweight Air Piston
  • NEW F80 SLT Air Piston Seal:
    -This new air piston seal is an advanced low-friction air seal that is designed with Scraper Lip Technology to retain FOX Float Fluid in the air cylinder

User Reviews (32)

Showing 1-10 of 32  
illnacord   Weekend Warrior [Jun 29, 2009]
Strength:

Looks, Technology, Fit, Name Brand Reputation, takes a beating.

Weakness:

No cable guide (Jagwire helped the lack of cable guides, which came a year later)

The top of the line offering for the F-series, Fox made famous the Terralogic auto-lock function, aka now Specialized Brain, and I have the the last year to have Terralogic technology. It's a silver/red/blue 2006 disc only F100X fork that was spaced down to 80mm by Fox.

When Fox went to the white forks in 2007, I picked up an F29 80mm for my 29er - sick fork as well, but the lack of Terralogic was noticeable! The remote lockout knob on the F29 wasn't up to task. The Terralogic is something many Fox owners want to retrofit into their new F29 forks, MTBR has a couple forum posts about the successful swap of internals. I have been happy with this fork, it does not leak, it does sag and there is a bit of a clunk fore and aft which I believed to be worn seals. It was sent into Fox HQ for the full 9 yards and came back feeling exactly the same with exactly the same fore aft motion. I suppose that is normal? And not many bike parts can get a "that's sexy" from the ladies, but this fork has!!!

Similar Products Used: Rock Shox
OVERALL
RATING
5
VALUE
RATING
5
Rick   Cross Country Rider [Jun 19, 2003]
Strength:

This is for the Fox F100X
Automatic (inertia) lock-out works very well.
Laterally stiff.
Easy to adjust and set up.
Wonderfully smooth and compliant when ‘bump threshold’ (lock-out) is exceeded.
Best ‘at speed’ fork I have ever ridden.
Lack of brake sag (fork does not compress with heavy front braking) allows you to rail tight, twisty single track with more control (and speed). It also allows for more efficient braking (bike stops faster).
No bobbing when going uphill.
The best XC fork I have ever ridden.
I don’t race, but I can see where this would be the best race fork ever.
Relatively light.
Look’s cool on my Yeti (let’s face it, this is all that really counts).
A truly awesome fork.

Weakness:

Price. The real genius of this technology is it’s simplicity. A brass cylinder (‘brass mass’) resting on a spring. Bump forces push the brass mass downward allowing fluid flow and fork movement. Simple and ingenious, yes; expensive, no. Come on Fox, we’ll support you if you support us. Give us a break with the price. The only reason I bought this fork is because I needed a fork in the middle of summer, and the Fox fork I wanted (RLC 100) was sold out everywhere.

Seals (bushings) weep excessive amounts of oil. Enough to end up with oil-wetted seals and upper tubes during each ride. Fox calls this oil weeping “hydrodynamic lubrication” that results in very little friction between the bushings and shaft. Oil-wetted tubes attract lot’s of dirt. I don’t like the looks of it and the tubes need to be cleaned after each ride. I hope Fox knows what it’s doing here.

Owner’s manual comes as a stapled on, single page addendum to the standard owner’s manual for all Fox forks. Not enough information is provided to understand how to change the oil in this fork.

Remember your first ride on a ‘Zoke Z2 (or Z1), back in the mid-1990’s? How buttery smooth and wonderfully compliant they were on downhills. The problems began when you turned your Z2 around to go uphill and found that they bobbed excessively, sapping your energy and robbing you of forward momentum. The Fox F100X has all the positive attributes of the Z2, but none of the negative attributes of the Z2. This is the highest compliment I can give, because up until now I considered the Z2 as the best fork I have ever ridden.
The automatic switch from lock-out to that wonderfully compliant feeling of the F100X is sometimes, but not always seamless. It depends on the kind of bump you hit to activate the fork. If you hit a slightly rounded rock or go into a small, rounded depression, then the transition is seamless. If, however, you hit a sharp, angular rock, then there is a nanosecond hesitation before the fork ‘opens up’ (becomes compliant). Note that once the fork ‘opens up’, it will stay open for 1 to 3 seconds (according to owners manual and confirmed in practice). So if you enter a rock field, the fork will ‘open up’ and stay open for the duration of the rock field. So once the action starts you don’t go through that locked-out to compliant transition again. When the trail smoothes out, then the fork locks out again. The point is, that the sometimes nanosecond hesitation is not always felt.
Basically, the fork is awesome. A ‘must have’ fork for racers and a great XC fork that will make you ride more efficient.

Similar Products Used: Zokes, Rock Sucx, Manicrap
OVERALL
RATING
5
VALUE
RATING
3
Kess   Racer [Jun 19, 2003]
Strength:

Works as promised. Like an old guy on Viagra (pretty stiff) when the terrain is smooth (10mm of stiff sag - which does not bounce when climbing out of the saddle on smooth terrain) when locked out. It responds instantly and without transmitting the feeling of the bump or dip.

It seems too good to be true!

Stiff which provides a lot of confidence when bombing downhill (much more confidence inspiring then the SID I had on).

Controls actually do something!

Large volume low pressure air spring works better than the other way around (SID, White).

I run the fork setup pretty plush which I can do since it only works when it needs to. This type of setup leaves me feeling fresher after long rides or latter in races.

They look good on my bike!

Weakness:

Heavier then the fork they replaced (I hate adding weight to a race bike). I made the decision that the extra weight was worth the trade for the increased performance of this fork.

More than I ever thought I would pay for a fork!

I like to go fast up and down hill. I also race regularly and do not want my equipment to slow me down. This fork eliminates the need to remember to lock and unlock the fork so I can just concentrate and how fast I am going and how much I am suffering.

The increased stiffness gives me much more confidence and thus I go faster with less braking on the downhills.

This fork perfectly compliments my riding style and my bike. In my last several race outings I have finished first and second. The motor is the key, but the fork has played a positive role in these results.

I highly recommend this fork. This may be the future direction of all fork design as the inertia valve only seems to improve performance (at no detrimental effect) and allow for a better (plusher) overall fork setup which helps me to go faster and have more fun - and isn't that what it is all about?

Similar Products Used: SID (several), White Bros.
OVERALL
RATING
5
VALUE
RATING
4
Lowndesy   Racer [Jun 12, 2003]
Strength:

Fox quality, those legs 32ml stanctions, no plastic did I mention Fox quality finish!!!!!! Only work when you hit a decent bump, push down on them and they feel bloody awfull! No need to worry about locking/unlocking froks at the top a climb or fire road.

Weakness:

None it's a another quality Fox product. Who cares about the price when they work so well.

I saw a poster for these forks last year at the Australian Bike Trade Show. I spoke to Bear the Fox tech and all round good bloke here in OZ about these forks and he was right they were worth the 9 month wait. Only 12 pair of these in the country. Stiff as and feel even better than my Fox Float RLC's has made my front end a little lighter and now I have the ultimate Race Bike. You get what you pay for and Fox is worth the dollars and the wait. Smooth as butter cutting through a knife, after 10 hours riding they are just getting better.

Similar Products Used: Rock Shox 02 Sid Carbon's, Mantiou Black Elites 80/100 02 model, Fox Float RLC 100's backed down to 80ml of travel on bike till new forks arrived.
OVERALL
RATING
5
VALUE
RATING
5
Steve Marshall   Weekend Warrior [Aug 30, 2003]
Strength:

When it works, this is a precision fork, slicing through turns with great accuracy, and ridding bumps in the trail with ease.

Weakness:

This is an update to two earlier reviews; my second F80x just went "active" full-time and I give up - I am no longer willing to be an unpaid beta tester for Fox. Dealer sent it back, they repaired it and I sold it. Purchased a 100RLC - fairly proven product from them.

I am sure Fox will solve this problem sooner or later as I see the trend in shocks moving toward interia valve type suspension. Next year's Specialized upper end ($$$) bikes are all coming with inertia valve suspension on the rear - they call it the IQ Brain.

The rear Brain shock on this Epic has worked well for me after a 1000 miles of riding on it, so I think they will get this technology right on the front shocks, too.

Similar Products Used: Fox 80RLC, Fox Talas RLC, Zoke Atom 80, Zoke X2Fly.
OVERALL
RATING
2
VALUE
RATING
3
Robert Taylor   Cross Country Rider [Jun 08, 2003]
Strength:

rigidity tracking action

Weakness:

bump threshold on bottom of leg mine does not click after 1 ride too much mud in the UK.also the forks below have much better braking power ???

works as it should do amazing no bob well only the 12mm of sag it is set up on a 1 in 9 road hill seated seamless suspension buy now forget the price

Similar Products Used: pace rc31 rigid carbon
OVERALL
RATING
5
VALUE
RATING
4
Rick   [Sep 01, 2003]
Strength:

This is a follow up from my below review.

I totally agree with c.j. below, the fork leaks oil from the right (damper) side. I called Fox about this and they gave me the same line of crap that is in their service manual. That is, that the fork has sponges under the seals to hold the oil and lubricate the slider tubes (hydrodynamic lubrication). OK, that’s fine, but the demonstration that there is something wrong is the fact that the leakage is asymmetrical. That is, the left side (air spring side) weeps little oil, but the right side leaks excessive amounts. If it were nothing more than simple hydrodynamic lubrication than both sides should weep oil at the same rate, but they do not. Here's what is going on. The left side of the fork only contains 35cc of oil, but the right side contains 160cc of oil. Oil in the right side is being forced out of the fork by hydraulic pressure produced during the compression stroke (the seals are not strong enough to hold back the fluid). This does not occur on the left side because the left side contains much less fluid and, therefore, produces much less hydraulic pressure. The fork is fundamentally flawed and Fox refuses to admit it. You cannot service this fork on your our own, so if you ride a lot, you will need to return it to Fox once or twice or more a year. This is ridiculous from a $700 fork. The problem is that are basically no good forks on the market by any manufacturer.

OVERALL
RATING
2
VALUE
RATING
1
Andy   Cross Country Rider [Jun 02, 2003]
Strength:

Fork functions as advertised without any problems.

Weakness:

None

Bottom line is that this forks works amazingly well. I was skeptical at first, but found that the fork works perfectly. I ride everyday and race on the weekends so this fork takes plenty of abuse and loves it!! I am a 22, 155 lb rider with 60lbs of pressure in the fork. BUY this fork!!

Similar Products Used: Manitou Mars, Rock Shox Quadra 21R
OVERALL
RATING
5
VALUE
RATING
5
Rich E   Racer [Sep 06, 2003]
Strength:

Super Super stiff! TIV is awsome! Light!

Weakness:

I've herd that FOX has seom awfull customer service

After 3 months of use i have concluded that this fork is awomse! TIV is so great! it takes some getting used to at first, but once you do you relise how much faster you go! High points
Super Super stiff
Smoothest slider i've ever used, very plush and linear
TIV
Light!
Lows
Price is very high

Thats about it. I was lucky enough to get the 04 version and i havent experienced any of the problems the others have been talking about. And for gods sake, Dont use Rock shox world cup!! it may be .35 lbs lighter, but this is SOOOO much stiffer, has TIV, actly gets advertised travel (you cant get more then 63mm from any of the 02-03 sid line) and you dont have to worry about a carbon crown craking(Though it looks cool as hell) From reading past reviews I reccomend trying to get the 04 model if you can!!

Similar Products Used: Rock shox world cup (Light, yeat so crappy!) Rock shox judu SL (not bad for a fork that is 3 years old!)
OVERALL
RATING
5
VALUE
RATING
5
STP   Racer [May 21, 2003]
Strength:

This is actually for the FX-100. I decided to go with the 100mm of travel, because I was using up just about all of the 80mm that I had before. The 100 can't weigh too much more than the 80mm. Almost went with a SID World Cup, but decided that Fox quality and durability were going to be the deciding factor not weight. The performs what it does exactly when it needs to. There is zero hesitation or lag in the suspension action. The transition from locked out to full action is totally seamless. You won't be able to tell. It just works. 21 clicks of bump threshold give you the adjustablity you need. I ran with the factory recommendation (6 clicks out) and this was great. There are other niceties. No brake dive for one. This helps you stop faster. Also, no fork dive when track standing. Boy, do those become easier. I work in aerospace and everything about this fork is aerospace, full-on-trick, quality. The knobs feel satin smooth in their action with a nice snickety action on the clicks. Very deluxe. The handling is superb. The bike tracks straight and true. You can really rock on the fireroad parts of the race course with this setup, but yet, nail the toughest parts of the course with confidence. It was my fourth ride on my brand new bike, that I had built up myself, when I raced the NORBA Nationals on May 17th. The combination of the bike and myself were good enough for 2nd place, Mens Sport 40-49. (Missed 1st place by 45 seconds!). If you don't spec this fork on your next ride, you'll be kickin' yourself in the behind. The new technology is here and it ROCKS!

Weakness:

Weight, but who cares? I'm right at 25 lbs for my full suspension Razorpig.

You won't regret buying this fork, I sure didn't. I'm totally stoked with how it works. The smooth climbs find this bad-boy totally locked out hard and rigid. I can't detect any play. Yet, a 100mm of Fox susp'n action, opens up when the going gets rough. It takes about a second and a half for it to relock, when it gets back to the smooth stuff. Sometimes, I hear a tiny pish from the inertia valve, but I rarely even notice it and it is not a detractor from what this fork does

Similar Products Used: None, Fox blows everything else away.
OVERALL
RATING
5
VALUE
RATING
5
Showing 1-10 of 32  

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