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Avy Chubbie..2 or 2.25 stroke?

933 Views 17 Replies 9 Participants Last post by kelly1, Dec 16, 2005

Dava

Discussion Starter · Dec 11, 2005

For the guys running chubbies/Avy shocks, what stroke are you guys running, 2 or the 2.25?

If I went from running the 3:1 ratio of the 2 to a 2.6:1 ratio with the 2.25 what would be the major benefits over and above the reduced stress on the shock?(Running on a Pack)

Also, apart from the bling thing, lasts longer? and the weight, what advantages would the extra $229 be for the Ti spring?

Nice one guys, just going through the final justification processes of a spend and need that little reinforcement

1 - 18 of 18 Posts

t66

· #2 · Dec 11, 2005

Dava said:
For the guys running chubbies/Avy shocks, what stroke are you guys running, 2 or the 2.25?

If I went from running the 3:1 ratio of the 2 to a 2.6:1 ratio with the 2.25 what would be the major benefits over and above the reduced stress on the shock?(Running on a Pack)

Also, apart from the bling thing, lasts longer? and the weight, what advantages would the extra $229 be for the Ti spring?

Nice one guys, just going through the final justification processes of a spend and need that little reinforcement

My DHS is 2.25 but I'm still 3:1 but have 6.75" of butter sweet travel. Have you talked to Craig yet? I spoke with him a while back and we concluded that in order for me to switch to a Chubby I'd have to have a 2" stroke reduced at the eyelet that would end up giving me less than 6". My 02' RFX is a 15" and I guess the problem is the front triangle is so small.

I decided to keep the DHS and slap on a ti spring and saved a good bit of weight. The ti spring value is in the weight savings, although they will outlast steel springs.

Great move going with AVY, you won't be sorry.

rr

· #3 · Dec 11, 2005

How does the 2.25 stroke change the leverage ratio? wouldn't it just add travel(and lower the BB at full compression)

Dava

Discussion Starter · #4 · Dec 11, 2005

t66 said:
My DHS is 2.25 but I'm still 3:1 but have 6.75" of butter sweet travel. Have you talked to Craig yet? I spoke with him a while back and we concluded that in order for me to switch to a Chubby I'd have to have a 2" stroke reduced at the eyelet that would end up giving me less than 6". My 02' RFX is a 15" and I guess the problem is the front triangle is so small.

I decided to keep the DHS and slap on a ti spring and saved a good bit of weight. The ti spring value is in the weight savings, although they will outlast steel springs.

Great move going with AVY, you won't be sorry.

Contacting Avy is my next move, I have a large Pack and didn't realise there might be fit issues? Skullcrack is running a chubbie on his 6 Pack, think that is a large too??? As for the Ti spring, I just need to justify it, can't just go with the bling!

tscheezy

· #5 · Dec 11, 2005

t66 and you are correct, it does not change the average leverage ratio, it only adds travel. The frame's linkage determines the ratio, not the shock. The shock's stroke determines how much travel you get for a given linkage: you multiply the shock's stroke times the leverage ratio.

Dava

Discussion Starter · #6 · Dec 11, 2005

tscheezy said:
t66 and you are correct, it does not change the average leverage ratio, it only adds travel. The frame's linkage determines the ratio, not the shock. The shock's stroke determines how much travel you get for a given linkage: you multiply the shock's stroke times the leverage ratio.

That''ll be my maths then, I approached it as the shock being the determining factor on the ratio, thus a longer stroke reducing the ratio! Thanks for the clarification. And now I actually think about it before opening my mouth-duh of course it is!

Wasn't looking for more travel, do suppose you know if a 2.25 would mean the tyre would strike the seat tube? Never really looked at the clearence on full compression. I think I'll just go with the devil you know 2" stroke shock.

FM

· #7 · Dec 11, 2005

Dava said:
Wasn't looking for more travel, do suppose you know if a 2.25 would mean the tyre would strike the seat tube? Never really looked at the clearence on full compression. I think I'll just go with the devil you know 2" stroke shock.

I would definately consider the 2.25. Compared to a 2" stroke, it should feeel identical through the first 1/2 of it's stroke, but after that the extra 3/4" will give it a bottomless feel. I have yet to try a 2" stroke shock that feels as good as my 2.25" vanilla RC.

Checking the clearance is easy- just take your existing shock off and set the bike up so the shock mountinh holes are 5-1/4" apart. I gues you could even drill holes in a stick or something to make sort of a place holder. Throw you biggest tires on check both your tire and seatstay yoke against the seat tube. Keep in mind that for the full 2.25" stroke to get used under full compression, your bottom out bumper would have to be compressed to nothing. You may also need to rotate your seatpost QR 180d to clear your seatstay yoke.

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Marshall Willanholly

· #8 · Dec 12, 2005

Dava said:
Contacting Avy is my next move, I have a large Pack and didn't realise there might be fit issues? Skullcrack is running a chubbie on his 6 Pack, think that is a large too??? As for the Ti spring, I just need to justify it, can't just go with the bling!

Yep, it's a large frame, and the Chubbie is the 2" stroke. No fit issues, the resi is smaller than a DHX. I've posted this before, but here's a comparison between the DHXs and the Avy.

It's pretty hard to justify the Ti spring at this length. I think the weight difference is just a couple ounces.

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t66

· #9 · Dec 12, 2005

spring rate?

Dava said:
Contacting Avy is my next move, I have a large Pack and didn't realise there might be fit issues? Skullcrack is running a chubbie on his 6 Pack, think that is a large too??? As for the Ti spring, I just need to justify it, can't just go with the bling!

What spring rate do you need? I might know where to find a ti and save you a few $$$

Dava

Discussion Starter · #10 · Dec 12, 2005

t66 said:
What spring rate do you need? I might know where to find a ti and save you a few $$$

I'm thinking 600/650?????

Dava

Discussion Starter · #11 · Dec 12, 2005

FM said:
I would definately consider the 2.25. Compared to a 2" stroke, it should feeel identical through the first 1/2 of it's stroke, but after that the extra 3/4" will give it a bottomless feel. I have yet to try a 2" stroke shock that feels as good as my 2.25" vanilla RC.

Checking the clearance is easy- just take your existing shock off and set the bike up so the shock mountinh holes are 5-1/4" apart. I gues you could even drill holes in a stick or something to make sort of a place holder. Throw you biggest tires on check both your tire and seatstay yoke against the seat tube. Keep in mind that for the full 2.25" stroke to get used under full compression, your bottom out bumper would have to be compressed to nothing. You may also need to rotate your seatpost QR 180d to clear your seatstay yoke.

Thanks FM, my head is currently firmly up my ar$e with flu and this was a minor exercise I was hoping someone had done

I'll stick the Highroller on tonight and give it a go (I was just going to get a beautiful assistant to do the measuring-wood and holes far too high tech for me

I must admit, the allure of more travel is starting to sound nice, this forum really is bad for ones health, I'll be changing the fork to compensate next

t66

· #12 · Dec 12, 2005

Sorry..You ought to keep a lookout in classifieds though. Ride Monkey and other sites, same fit as the Romic springs. There's quite a few around. I picked up one for $125, at that price it's easier to justify. Compared to my Avy steel spring I save .5 lb.

Trond

· #13 · Dec 12, 2005

600*2 RCS Ti spring: 281grams
550*2 RCS Ti spring: 310grams!!!

550*2 Romic Steel spring: 340grams

550 TI is heaver than 600 because it has more windings with same coil-diameter. A 2.25 might just be lighter because it has a less windings.

Lucky7

· #14 · Dec 12, 2005

Just a heads up about that contact issue, I think one of the problem areas when fully compressing the shock is at the back of the seattube where the cable stop for the front derailleur is.

Dava

Discussion Starter · #15 · Dec 12, 2005

Lucky7 said:
Just a heads up about that contact issue, I think one of the problem areas when fully compressing the shock is at the back of the seattube where the cable stop for the front derailleur is.

Just measured up, if it is going to hit it will be the tyre on the cable followed by the seatstay yoke hitting the seat tube, the cable hanger is miles away

I measured up and at the safest point with my biggest tyre (Highroller 2.5) I have 5.5" thus the 2" stroke with the bottomout bumper completley squashed is easily within a safe margin (suprise suprise), I think the 2.25 would work, but bottom out bumper would need to be .25" (probably doable) at full bottom out. Anyone wanna take a guess what the bumper squashes down to?

And on that note, out of interest (never really gave this a thought) with the stroke multiplied by the leverage ration and the bottom out bumper squashing to lets say max .125" doesn't that imply max travel of 5.63"ish travel? Or have I missed the point completley?

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FM

· #16 · Dec 12, 2005

Dava said:
I think the 2.25 would work, but bottom out bumper would need to be .25" (probably doable) at full bottom out.

It really depends on the bumper. I've had my bumper compress to pretty much nothing at had metal-on-metal contact with my 5" rockers. Keep in mind, as long as you do the 5.25" eyelet-to-eyelet test you shoudl be OK, as the bottom out bumper comes out of that distance.

t66

· #17 · Dec 13, 2005

Trond said:
600*2 RCS Ti spring: 281grams
550*2 RCS Ti spring: 310grams!!!

550*2 Romic Steel spring: 340grams

550 TI is heaver than 600 because it has more windings with same coil-diameter. A 2.25 might just be lighter because it has a less windings.

Avy steels are way-heavier and last alot longer Romics, more winds thus less fatigue over time. Just hand-to-hand comparison, my 500 lb Avy steel is probably .75 lb heavier than my RCS 500 ti.

kelly1

· #18 · Dec 16, 2005

2" travel with A rockers on a 2000 RFX..Barely enough seattube clearence for a large volume tire with this combo...kelly

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