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Fox F100 1.125" and 1.5" taper weights

4748 Views 18 Replies 9 Participants Last post by rockyuphill, Mar 7, 2011

rockyuphill

Discussion Starter · Feb 20, 2011

The Fox website specs the weight of the F100 FIT Q15 1.125" fork at 1500gms and the F100 FIT Q15 1.5" tapered steer tube fork at 1490gms.

Having had the after market version of both in my hands and on the scale I was really disappointed to see the F100 with the straight 1.125" uncut steer tube was 1570gms and the 1.5" tapered uncut steer tube version weighs in at a whopping 60gms more at 1630gms. So much for the idea that the tapered steer tube version is actually lighter.

If only Magura made a Durin Race or SL with the Q15 dropout.

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1 - 19 of 19 Posts

xc71

· #2 · Feb 20, 2011

Thats not cool. Did Marzocchi buy out Fox

My DT EXC 150 15TA is only 90 grams more.
If you could run 120mm of travel, to me theres only one WW choice in a 15TA and thats the 2011 Sid World Cup Carbon tapered steer tube 15TA @ 1450 grams.

rockyuphill

Discussion Starter · #3 · Feb 20, 2011

I've been thinking about that 120mm carbon steer tube SID and just sticking a 20mm spacer in it.

CactusJackSlade

· #4 · Feb 21, 2011

Grams.... shmams.... Loose 3/4 pound or more... go Lefty! :thumbsup:

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743power

· #5 · Feb 22, 2011

surprising to see the tapered version that much heavier. I know fox uses thicker stanchion tubes on the higher travel versions, it looks like your aftermarket f100 is actually an f120 with a spacer to lower it. I have no clue what to say about the tapered one. I weighed a straight and a tapered reba xx 29" and the tapered version was 80g lighter.

rockyuphill

Discussion Starter · #6 · Feb 22, 2011 (Edited)

Yeah and the only reason I tracked down the 100mm tapered version was to get that 10g weight saving over the straight steer tube.

That difference is just about exactly what a F120 converted to a F100 would weigh, and that was the only option offered in Canada because OGC only stocks the F120 tapered steer tube version, not the 100mm. That's why I went south of the border to pick one up. The box says F100 so if it was a factory production line conversion of a 120>100 to fill an order, that would tick me off.

The F100 Tapered steer tube fork is for sale

tehan

· #7 · Feb 27, 2011

my F100 fit RLC 29er version with taper steerer weight 1730g!! So having 1600 ish grams i would be a happy man

rockyuphill

Discussion Starter · #8 · Feb 27, 2011

The F100 29 FIT fork is spec'd at 1760gms, so you're winning by 30gms.

kongofu

· #9 · Feb 28, 2011

rockyuphill said:
Having had the after market version of both in my hands and on the scale I was really disappointed to see the F100 with the straight 1.125" uncut steer tube was 1570gms and the 1.5" tapered uncut steer tube version weighs in at a whopping 60gms more at 1630gms. So much for the idea that the tapered steer tube version is actually lighter.

Is that weight for the tapered fork with or without the 15mm QR axle?

rockyuphill

Discussion Starter · #10 · Feb 28, 2011

I weighed my forks with the 15mm axle in place, as that's how Fox spec's them.

XgreygOOse

· #11 · Feb 28, 2011

2

Also you could save more weight (32g) with the new Tune DC15 (15mm QR axle)

Fox 15mm QR axle (72g)

Tune DC15 (39.7g)

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rockyuphill

Discussion Starter · #12 · Feb 28, 2011

If Fox released the Kabolt axle that they developed for Kabush, that would work too.

WR304

· #13 · Feb 28, 2011 (Edited)

743power said:
surprising to see the tapered version that much heavier. I know fox uses thicker stanchion tubes on the higher travel versions, it looks like your aftermarket f100 is actually an f120 with a spacer to lower it. I have no clue what to say about the tapered one. I weighed a straight and a tapered reba xx 29" and the tapered version was 80g lighter.

That's what I was told about my aftermarket 2011 Fox F100 Terralogic fork with 1.5" tapered steerer and 15QR too.

In my case there weren't any 2011 Fox F100 Terralogic forks in stock so the distributor reduced the travel on a 2011 Fox F120 Terralogic to 100mm before sending it out to the shop. Apparently in this case it's exactly the same fork as a F120 Terralogic but with the travel reduced. I don't know if that's true for other Fox F100 forks though?

Are there any other aftermarket 15QR compatible skewers besides Tune? I'm thinking of getting a custom 15mm thru axle skewer made which would use a donor DT RWS skewer for the tightening mechanism. It probably wouldn't be much lighter than the stock one but you would be able to tighten it down more than the stock quick release skewer, in order to maximise the benefits of having a thru axle on the fork.

kongofu

· #14 · Mar 1, 2011

My F100 FIT RLC Tapered QR15 came at 1604g uncut, with QR, without hose guide. Do you think this is also a 120mm converted to 100mm ?

Anybody knows any way of telling if a fox is a "true" F100 or a converted F120? (without looking at the internals)

dougal.s

· #15 · Mar 1, 2011

rockyuphill said:
If Fox released the Kabolt axle that they developed for Kabush, that would work too.

The Kabolt only works in the case where you have race support, such as in an XC race. Otherwise you'd be carrying around some heavy tool to do and undo the bolt if you have a puncture.

I know, I know. A true WW wouldn't think so practically.

rockyuphill

Discussion Starter · #16 · Mar 1, 2011

You already need an 8mm Allen key for CB Eggbeaters and crank bolts anyway.

dougal.s

· #17 · Mar 1, 2011

rockyuphill said:
You already need an 8mm Allen key for CB Eggbeaters and crank bolts anyway.

8mm allen key goes on the list of tools I don't carry with me, never needed to tighten cranks or pedals on a ride. Much the same as in the past I didn't carry headset spanners with me.

WR304

· #18 · Mar 1, 2011 (Edited)

rockyuphill said:
If Fox released the Kabolt axle that they developed for Kabush, that would work too.

If you had your own 15mm axle made then you could design it to be used with a 5mm or 6mm allen key, instead of the 8mm allen key of the "Kabolt". A "Kabolt" doesn't look to be anything special. It appears to be simply a 15mm thru axle with an allen key fitting.

I thought the 8mm allen bolt on the "Kabolt" was intended for high speed wheel changes. So long as you're careful then a 5mm or 6mm allen key in an aluminium or titanium 15mm thru axle should work just as well without rounding off the edges.

A 5mm allen key size works fine for normal skewers so should do the same for a 15mm axle. With the larger 15mm axle you could continue the allen key fitting deeper into the axle also, increasing contact area, saving weight and making it less likely that the allen key fitting will round off.

Controltech 5mm allen key titanium skewers (standard size)
http://www.chainreactioncycles.com/Models.aspx?PartnerID=79&ModelID=19643

Edit: Here's rockyuphill's original thread about the "Kabolt"

http://forums.mtbr.com/showthread.php?t=669402

Pictured below: "Kabolt" 15mm thru axle

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rockyuphill

Discussion Starter · #19 · Mar 7, 2011

The Fox 15mm QR axle is 71gms, so it would appear that weights on the Fox website don't actually include the axle weight, even though it says it does.

That doesn't explain why the 1.5" taper version is still another 70gms heavier than spec'd with the axle weight accounted for.

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