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Old 11-09-04, 09:02 AM   #1
math2p14
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New fork and rear shock for an SX.

Hi all,

I am trying to add more punch for trail/dh/fr usage on my Enduro SX 03/04. Currently i am running a 2003 Z1dropoff ETA fork with SSVF damping and QR dropouts. The rear shock is a Vanilla R 6.75" i2i , 1.75" stroke. Compression ratio on the linkage is 2.6-1 with stock linkage.

My ideas,

To get a Z1FR1 2005 with 150mm, HSCV damping and 20mm TA dropouts in order to increase my confidence and subsequently performance on steep descents and landings.

Optionally to install a BETD linkage plate that boosts up compression ratio from 2.6-1 to 3-1 hence giving out 5.25" of rear travel.

Optionally Optionally... to be able to find a rear shock with 2" stroke that has a reasonable i2i (max 7") so that in conjunction with the BETD plates i ll be getting 6" of rear travel. ( i am unaware of someone that produces a 2" stroke shock with an i2i of 7" or less)

Buying a new bike is not an option, and a bigger bike (demo8) would be useless where i live without a car (SW England). I got enough trouble hauling an mtb on the trailhead from where i live, i dont want to carry more, plus i really like the rear end and the SX in general. My problems lie in the front of the bike, but some extra punch at the rear would be also wellcome though not essential.

Thanks in advance for your input.
Yannis

BTW sorry that i was away from bikeforums for so long.... slap me at will
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Old 11-09-04, 10:42 AM   #2
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Your plan sounds fine, go with that.
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Old 11-09-04, 10:51 AM   #3
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Your plan sounds fine, go with that.

Yes but it is a 3 part plan, should i stick with 1,2 1 alone or 1.2.3?
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Old 11-09-04, 10:52 AM   #4
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1,2,3
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Old 11-09-04, 11:40 AM   #5
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Hahaha..just like I said...do all three and you have a smoking fr machine with good travel in the range I like and after talking to you, you need.

Then save those precious coins for that banshee you want in the future
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Old 11-09-04, 01:27 PM   #6
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Thanks mates.

I just need to find a rear shock expert now to learn which shocks with 6.75" i2i or 7" i2i could get 2" stroke.
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Old 11-09-04, 02:34 PM   #7
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i was in kind of a similar situation to you with my bike (norco fluid 3). getting a 6" fork on my bike would have raked it out way too much, so i opted for 5" and ended up getting used a 2003 z1 fr.

i have the same rear shock as you - same stroke/i2i measurements and everything. i was playing with the idea of getting a shock with a longer stroke/i2i but i didn't want to raise my bb height anymore than it was already at with the 5" fork (my bike originally came with a 4" exr). it's gonna be difficult to find a shock with the same stroke/i2i as the one we have because it's a custom spec that i guess both specialized and norco was using on some of the bikes. so unless you order a custom shock, which would probably cost a ton, it's gonna be pretty hard finding a replacement shock with those measurements... which is why i'm personally considering on going for the PUSH industries platform valving upgrade.

i'm a firm believer in quality over quantity and feel that having a better fork up front and a better shock in the back will inspire just as much - if not more confidence than more having more travel would... but then again, i'm a newb so what do i know? heh.

think about what getting the longer fork and longer stroke/i2i is going to do to the ride characteristics of your bike and if the changes aren't that drastic for you, i'd say go for it... if you're like me though and don't want to change it too much, i'd say go for a better 5" fork than the one you've presently got - a 20mm front axle will definitely be a good option for you - and go for the PUSH upgrade for your vanilla r.

just my 2 cents.
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Old 11-09-04, 03:18 PM   #8
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Rasheed thank you very much for your input my friend.

The 150mm Z1 will raise my front end by 20mm. This basically means that i ll get a HA of 68 degrees which is fine by me. Also the bb will be raised by 10mm roughly which is again desirable since the bb height on the SX is low-ish.

With respect to the rear end, the BETD linkage will raise the rear by 20mm, which will essentially offset the rise up front caused by the new Z1, getting the HA back to 69deg, and raising the bb by another 10mm.

So new Z1 150mm ->> 10mm bb rise, 68deg HA, rear travel stock at 4.5"
New Z1 150mm & BETD link ->> 20mm bb rise, 69deg HA, rear travel 5.25"

Current setup : Z1dropoff 130mm, bb at 12.5" , HA 69deg.

Yannis.

Hope this helps.
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Old 11-09-04, 04:08 PM   #9
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So in short. With all the possible upgrades you have a 20mm increase in bb height, 1.5inish increase in rear travel and 1 in increase in the front.

Doesn't sound to bad if you want to be a one machine rider
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Old 11-09-04, 04:12 PM   #10
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Originally Posted by Maelstrom
So in short. With all the possible upgrades you have a 20mm increase in bb height, 1.5inish increase in rear travel and 1 in increase in the front.

Doesn't sound to bad if you want to be a one machine rider
Actually since no-one is producing a 6.75" i2i 2" stroke shock, i am at 1" rise in front, 0.75" in rear and 20mm bb height increase.
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Old 11-09-04, 04:54 PM   #11
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you have to also remember that even though it's been "offset" somewhat, that the ride height will be that much higher.

with my bike, i had the rear set at 4" (4.48" to be exact) to go with the 4" fork. the HA on mine at with those settings was 67.5... bb height was at 13.38". putting the 130mm z1 fr on the bike slacked it out even more. so i had to change the rear back to 5" (5.12" to be exact). that offset the increase of travel on the front and brought the HA back close to 67.5. the bb height was increased more than it was at the stock settings though (4" front, 5" back giving it a bb height of 13.58).

after putting the new fork on and changing the rear back to 5" i felt a definite difference in the way the bike felt under me. it felt a bit "bigger", that's for sure. the bike handles great though, so i'm not complaining. it doesn't feel as stable as it did when i had it set at 4&4, but that's ok with me... i like the added cushy feel of the extra inch front and back.

good luck with the planned upgrades... don't forget to let us know how it works out.

about the rear shock, i know romic makes custom fabrications... if you got the cash, you might want to inquire about getting a custom rear shock with the stroke/i2i you want.
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