Updated: Fox F100 RLC FIT review
|$775
BikeRadar verdict
"Spot-on damping and spring rates plus a light-yet-stout chassis – just watch out for oil levels"
Fox Racing Shox's flagship cross-country suspension fork trades in the company's long-running open-bath damper design in favour of a fully enclosed 'FIT' (Fox Isolated Technology) cartridge architecture borrowed from the 36 and 40 platforms.
The FIT design separates the damping oil from air and, according to Fox, virtually eliminates cavitation in rough terrain. Some testers reported better handling on long stepped or rocky descents, but it's difficult to tell with just 100mm of travel on tap here – it's likely more obvious an effect with longer-travel bikes.
The real benefit of FIT in this application is the 71g of weight it saves courtesy of the reduced oil volume. That, plus a few minor chassis tweaks, now makes the 32 F100 RLC FIT one of the lightest Fox forks we've tested at just 1.49kg (3.27lb) with an uncut 1 1/8in alloy steerer – virtually the same as a current non-remote RockShox SID Team.
Though there's less weight than before, everything else we raved about on the old F100 RLC (which remains in the lineup) remains or is even improved upon. Damper and spring rates are spot-on, making for a supple ride over stutter bumps plus excellent control on bigger hits and drops, and an overall light and lively feel in the rough.
Provided you invest the time to dial in the various settings, front wheel traction is superb and brake dive is well controlled, too. No problems getting full travel where appropriate, either.

Chassis stiffness is impressively high thanks to the 32mm-diameter aluminium upper tubes and beefy cast magnesium lower legs with their broad-shouldered arch. Our test fork does one better with the addition of a 15mm through-axle, which has a positive effect on steering precision in fast, technical terrain when compared to a typical hub's 9mm quick-release skewer.
Instead of occasionally pinballing your way through rock gardens and off-axis roots, it's now more a matter of point-and-shoot (with a little bit of 'hold on tight') and the overall sense of control is heightened as well. The through-axle is no panacea, mind you, but it does let you charge through certain sections with that little bit of extra speed and control. If you want even more stiffness (and if your frame allows), Fox also offer the F100 with a tapered 1 1/8in-to-1 1/2in steerer.
Whether or not 15QR is justified in light of the industry-standard 20mm system is still a hotly debated topic though. At 94g, the smaller-diameter Fox axle is comparable in weight to RockShox's 86g Maxle Lite and until more companies develop dedicated 15mm wheels and hubs (most are conversions on existing 20mm shells), any significant weight savings owing to 15QR's narrower hub spacing and bearing sizes are still more a matter of potential than reality. Even so, 15QR is an absolute no-brainer as an alternative to standard quick-releases: it's far stouter, much safer and more intuitive to use for novices.

Alas, all was not perfect with our test fork, as our initial rides were marked by numb hands and an overly harsh feel – tell-tale signs of excess stiction. As it turns out, our oil bath fill levels fell well short of Fox's recommended 20cc per side (about 15cc in one and barely 5cc in the other). The fix was quick to perform (no more than 10 minutes) but it's one consumers shouldn't have to do with a new fork.
Experiences with other forks since this review was first published suggest stiction in the FIT cartridge is far from an isolated incident. The severity of the stickiness varies from fork to fork, although most get better the more you use them. Lack of bob will actually be seen as an advantage by a lot of the racers and fast riders who’ll use the F100 however, so it’s less of an issue than on longer forks.
Otherwise, the magic continues as usual and this is hands-down one of the best cross-country forks on the market – but you might want to keep a bottle of fork oil on hand just in case.
What's the score with BikeRadar reviews? You can find a full explanation of our ratings here.
User Reviews
There are 16 reviews on this post
Showing 1 - 16 of 16 comments
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stu8975
Posted Mon 10 Aug, 10:15 am BST Flag as inappropriate
100g light than Sid team?...mmm...not lighter than my '09 Sid Teams @ 3lb 3oz (uncut) 1.45kg...weighed on a parktools DS-1 digital scales...still nice forks though..
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Dirtydog11
Posted Mon 10 Aug, 3:38 pm BST Flag as inappropriate
4.5 stars. How can you give 4.5 stars to an item that has QC issues and doesn't work as it should?
Can you guarantee the pair I buy are not going to need filling, No?
Then please don't recommend them! ( in my book 4.5 stars is as good as a recommendation).
I bought a Rolex watch last week it'll be fine once I've took it back and had the hands fitted!
Bloody joke!
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angryasian
Posted Mon 10 Aug, 4:15 pm BST Flag as inappropriate
stu8975: sorry, should have clarified that that SID Team weight was for a remote version. Article now updated.
Dirtydog11: To be honest, I definitely debated this one in my head. You're absolutely right that end users shouldn't have to deal with a possible oil bath issue (and we've stated as such). Ideally, this is something that should be taken care of (or checked) no later in the line than the point of sale so that it's completely transparent to consumers (assuming this issue is widespread). But if not, it's literally a 10m job to correct if your fork is affected, it's not an inherent design flaw, and the resulting performance is absolutely superb.
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tywin1
Posted Mon 10 Aug, 10:26 pm BST Flag as inappropriate
Completely writing off a great fork because it didn't have enough oil is stupid (dirtydog) - if I were to buy one of 'em I'd probably fiddle with the oil levels anyway.
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legin
Posted Tue 11 Aug, 9:11 am BST Flag as inappropriate
am i the only one who thinks the price of forks is plain stupid at the moment how can they justify it.its a fork after all.plus i find rockshox more reliable
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RACEPACE
Posted Tue 11 Aug, 10:05 am BST Flag as inappropriate
Have they fixed the creak leg problems that seem to affect so many Fox forks, it's usually the legs coming loose from the crown?
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angryasian
Posted Tue 11 Aug, 2:47 pm BST Flag as inappropriate
No problems with creaking on our test fork (which I beat on quite liberally). If you're having issues on yours, though, you can try some Loctite 290. It's very low viscosity and is designed to wick into assembled parts. Used it for years when I was working in shops with very good results. Flip the bike over, apply a few drops, let it seep in, apply a few more. Let it sit for a day or two to cure and you should be good to go (assuming the problem is the stanchion/crown interface and not something else).
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RACEPACE
Posted Tue 11 Aug, 6:03 pm BST Flag as inappropriate
Not sure I'm keen on re-sticking my own forks!!!! To my mind it shouldn't happen in the first place, but it does seem to be a common problem, I know of a demo fleet of 6 bikes and 3 have creaking forks inside 6 months use? just seems a bit rich when you consider the cost and the QC problems you have highlighted in your article, if they can't get the oil level right why should I have confidence in the other areas of their manufacture?
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JK in the UK
Posted Sun 6 Sep, 1:14 pm BST Flag as inappropriate
RACEPACE - I couldn't agree more. What with the well known problem of Fox forks being notorious for wearing their stanchions (which the press have yet to acknowledge), I can only assume Fox pay a lot more in advertising than Marzocchi do....
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noinasleft
Posted Sat 6 Feb, 6:53 pm GMT Flag as inappropriate
I have a new 2010 Trek ex9 and my bike has exactly the symptoms you describe ok on big hits but not plush at all. . Numb hand and a feeling of little or no suspension in the fork even after backing of the air pressure to a lot lower than the manual says.
Before taking it back to the dealers which is a bit of a trip if its only a 10 min job I will check the oil level myself. . How do I check it - I have looked on the FOX site but found no simple way of doing it. and the FOX DVD supplied with the bike is from 2007!
Not impressed so far...
Thanks for any help
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NiXO
Posted Tue 9 Mar, 11:28 pm GMT Flag as inappropriate
Sorry if a comment is off-topic. If you're looking for plush (exactly plush on all range of travel) and light fork - just go for DT Swiss. They have 15qr, light chassis and Launchcontrol and simply works on all terrain. As for me, i've tried new Fox's and, as previous year forks, didn't like it at all. And i can't images why price on Fox is comparable with DT (Swiss made)? So why go for Fox?
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Turveyd38
Posted Sun 6 Jun, 1:21 am BST Flag as inappropriate
I like Fox Forks but the price is getting stupid £669 for a 100mm fork.
Noinasleft, you need to undo the bottom bolts then tap them through then drain the oil out, measure it and refill using a syringe really to the required amount.
You could also get the feeling from, Rebound to fast, tyres too hard, or bike setup is to long putting too much weight on your hands.
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Mr Lebowski
Posted Sun 6 Jun, 12:01 pm BST Flag as inappropriate
What about the service intervals on Fox forks?? 15 hrs?? Thats nuts Im racing for 7 days in a months time - what am I supposed to do, get them serviced every other day?? Come on Fox sort it out! You make a great fork but in the real world it doesnt hold up..
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bomberesque
Posted Tue 8 Jun, 8:10 am BST Flag as inappropriate
Mr Lebowski; look it up; service interval for RS forks to lube the seals (the 15hr job on fox) is *every ride*. so take your choice
as for fork prices I heartily agree, current MSRPs are nuts. That said, and DTSwiss aside, when do you need to pay anything close to MSRP for a new fork? I have bought current RS and Fox forks this year all at 40-50% off MSRP. While 650 is nuts, 350 ... well, I can swallow that for a top end fork. My theory on this is that Fox/RS et al set MSRPs high so that you can justify the whole bike purchase ("I bought this 1500 quid bike and it came with a 650 quid fork!"). OEM supply has to be where the business is for these guys rather than the aftermarket and in the aftermarket? well, you can get the heavy discount and feel like you've got a bargain. Honest? no. Good business? Maybe.
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bomberesque
Posted Tue 8 Jun, 9:03 am BST Flag as inappropriate
oh, and I'm stoked (for want of a better word) to see bolt through systems coming to XC forks at last (sorry Maverick, I know you've been at it for years).
It's long been clear that using the hub to stiffen up the fork ends should allow for lighter yet still stiff enough stanchions and sliders. Roll on the wheels to suit and I'll be trading up next year
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antfly
Posted Wed 9 Feb, 12:57 pm GMT Flag as inappropriate
A Fox 32 F100 came on my bike nearly 5 years ago, i've never done any maintenance on it and it has never given me the slightest problem. It works superbly and it is plush if you get the air pressure right. Fantastic fork.
Specification
- Name:
- 32 F100 RLC FIT 15QR
- Built by:
- Fox
- Price:
- $775.00
- Available Colours:
- White
- Weight (kg):
- 1.53 kg
- Steerer Size:
- 1 1/8 Inches
- Weight (lb):
- 3.38 lb
- Stanchion Diameter:
- 32 mm
- Spring Type:
- Air
- Disc Caliper Mount:
- Post Mount
- Travel:
- 100 mm
- Damping Adjustment:
- Air spring pressure, Lever actuated lockout, Lockout threshold adjustment, Low Speed Compression, Rebound
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