PDA

View Full Version : WhooHoo! New chainline!

GarthMc
03-13-2006, 06:32 AM
:coold:
http://www.observedtrials.net/otn3/Chainline1.jpg

Just put together my mates pitbul to ride while I wait for my Adamant A2 to arrive and it turns out I don't need a derailleur!! I think I'll trim the shitty end off the bendy hanger, but I shoud prolly ask Mcbeth first.

-Garth
rush
03-13-2006, 06:34 AM
Nice. There are people that run that setup, not sure how well it lasts!
philth
03-13-2006, 07:03 AM
Two Words
"Shaddow Conspiricy" (?spelling?) half link chain and it'll last 3times as lone if not more.
GarthMc
03-13-2006, 07:17 AM
Two Words
"Shaddow Conspiricy" (?spelling?) half link chain and it'll last 3times as lone if not more.

Are you saying this won't last? I haven't had a setup like this before.
trialsn
03-13-2006, 10:46 AM
it will ast for like 1 ride, chain will stretch due to insain tension...then stnap or skip and you'll fall to your bloody death. happened to me on saturday
Giant1118
03-13-2006, 01:01 PM
dieing sucks
toyota200x
03-13-2006, 01:15 PM
Just put a tensioner on there. It would look better anyways.
durkie
03-13-2006, 03:18 PM
no way will it stretch that much in one ride. if it did, any bike that didn't use a spring-loaded tensioner wouldn't work, which includes all mods, track bikes, and singlespeeds with rennen type deals...

you're good for a while, lucky bastard. tensioning sucks.
rush
03-13-2006, 04:42 PM
Or you could run THE PHANTOM GEAR!!!!!
trialsn
03-13-2006, 04:49 PM
dude if its tight enough it will stretch or snap.
Acolyte
03-13-2006, 04:53 PM
no way will it stretch that much in one ride. if it did, any bike that didn't use a spring-loaded tensioner wouldn't work, which includes all mods, track bikes, and singlespeeds with rennen type deals...

you're good for a while, lucky bastard. tensioning sucks.

I set mine up like that once. Chain stretched in one ride, at least enough to make the tension kinda suck.

If your chain is already stretched, should be decent.
GarthMc
03-13-2006, 05:32 PM
I set mine up like that once. Chain stretched in one ride, at least enough to make the tension kinda suck.

If your chain is already stretched, should be decent.

This is the same chain I've been running for about 6months or a year, so it's stretch already, and it has just a little bit of play in it so I don't think it'll be too bad. I'll take it easy on the first couple of rides any way cause I'm recovering from a torn ligament in my ankle at the moment.

Will let you know how it goes.

-Garth
BigInJapan
03-13-2006, 06:52 PM
What gearing are you running?
GarthMc
03-13-2006, 07:50 PM
What gearing are you running?

22-18
EchoTsi
03-13-2006, 08:07 PM
How tight is that? might wanna try the Shadow Conspiracy if you can find it. Some bmx guys are saying they have hit grinds on it and cant tell where on the chain they hit. So, I'm guessing its pretty strong. Might wanna check fitment on the freewheel prior to purchasing it cause its pretty wide.
BigInJapan
03-13-2006, 08:31 PM
I don't think it will work when you go to put a new chain on. I tried to run 22-18 on my pitbull with a new chain and it was way too short to even get on.

I considered filing the dropouts to make it fit because the chains too damn long on 22-19 but I didn't think it was worth it.
lucky13
03-13-2006, 08:42 PM
dude if its tight enough it will stretch or snap.

YEa yea yea,.. but it works.

I ran that for a while on the desalvo with 385mm stays and a 22t 19t. It was really taught, but not so much that I was worried about it, if anything it ROCKed since I knew it wasn't going anywhere.

I have to re work the math for what the perfect chainstay length would be for a 18t - 15t combo. Probly around 380?
tomacropod
03-13-2006, 10:54 PM
the loss of tension is as much from bedding in of sprockets as from chain tension.

Magic gears are great Garth, but rarely will they stay that way for long. I had one on my XC bike. 32/16, perfect. After one race it was so loose it would come off all the time - switched to ENO !

- Joel
MegamoMidwest
03-13-2006, 11:25 PM
YEa yea yea,.. but it works.

I ran that for a while on the desalvo with 385mm stays and a 22t 19t. It was really taught, but not so much that I was worried about it, if anything it ROCKed since I knew it wasn't going anywhere.

I have to re work the math for what the perfect chainstay length would be for a 18t - 15t combo. Probly around 380?

it cannot be explained by mathematics. only magic.
tomacropod
03-14-2006, 12:09 AM
no actually some guy did up a spreadsheet/macro to figure out magic gears given your chainstay length
GarthMc
03-14-2006, 04:24 AM
the loss of tension is as much from bedding in of sprockets as from chain tension.

Magic gears are great Garth, but rarely will they stay that way for long. I had one on my XC bike. 32/16, perfect. After one race it was so loose it would come off all the time - switched to ENO !

- Joel

Yeah I didn't think it would last for long (although all the rings and chain are well and truely bedded in), but I ain't switching this bike to ENO, I like my king too much :drool:. Am am seriously thinking of buying one for my XC bike though.

On a side note, that guy that was going to lend me the fixie is back in town so I'm going to pick it up in a week or two when my ankle is back to normal, I'll think about SS after I've tested that one a bit.

-Garth
tomacropod
03-14-2006, 04:40 AM
ooh post pics of that track bike when/if you get it.

- Joel
GarthMc
03-14-2006, 06:39 AM
ooh post pics of that track bike when/if you get it.

- Joel

Shall do.

Does the brand "Chasling" mean anything to you? Cause that guy I'm getting the bike off was the designer for them. They have a curved seat-tube, which I'm told was outlawed by UCI I think and thus never really hit mass production. He was about to start making them with Litespeed just before they changed the ruling. Or something along those lines.......:blah:

-Garth
BigInJapan
03-14-2006, 09:06 AM
Quick question on the ENO.... does it allow both forward and backwards adjustment? A few mm's forward and 22-18 would be perfect on the 04 pitbull's.
tomacropod
03-14-2006, 03:45 PM
yes it does. The mounting bolts are offset 7.5mm from the centre of the axle, allowing 7.5mm of forward, backward, up or down movement. I tend to tension mine down and forward so I don't lose BB height.

- Joel
streets
03-15-2006, 12:19 AM
i have to add one thing to this thread. i run my derraileur so tight it rests against my chainstay, and on my street bike i run sans tensioner. neither bike destroys chains or has any problems with either setup. the tension to hold a chain in place is so insignificant when compared to the massive torque put through a trials drivetrain that that the "dangerous tension" theory is rediculous.

that is unless you have to physically lever the wheel into the dropouts in which case it could be a problem.
lucky13
03-15-2006, 04:47 AM
no actually some guy did up a spreadsheet/macro to figure out magic gears given your chainstay length

YYYEEEEEEEESSSSSSSSSSSSSSsssssssSSssSSsss,,... GIVE US thissssss magical tome,... my preciousssSsSsSssss GIVEUS the SSSssssSssspreadsSssssshheetSSssssss MACRO
tomacropod
03-15-2006, 05:47 AM
YYYEEEEEEEESSSSSSSSSSSSSSsssssssSSssSSsss,,... GIVE US thissssss magical tome,... my preciousssSsSsSssss GIVEUS the SSSssssSssspreadsSssssshheetSSssssss MACRO

uh, you're strange.

the applications are:

SSconvert and
FixMeUp

I don't know where they've gone. They seem to have been absorbed by the woobs.

I still don't know if you're making fun of my geekiness.

- Joel
lucky13
03-15-2006, 05:50 AM
uh, you're strange.

the applications are:

SSconvert and
FixMeUp

I don't know where they've gone. They seem to have been absorbed by the woobs.

I still don't know if you're making fun of my geekiness.

- Joel

:bowrofl: ,.. I like to laugh at myself if that's what you mean,.. .. but to answer your question; yes you are a geek and we love you for it:love:

Speaking of geeking out,. now that you mention it, I think I've seen those sheets from the BT.com days years ago,..
durkie
03-15-2006, 06:49 AM
http://eehouse.org/fixin/

i'm 0 for 1 with it...
tomacropod
03-15-2006, 02:59 PM
aha!

thanks Durkie.

:love:

- Joel
KMT
03-16-2006, 11:14 AM
22-18

That's strange.
22-20 + 375cs = no deraileur
So 375mm cs is a good choice. :)
tomacropod
03-16-2006, 03:27 PM
I doubt very much that the chainstay measurements are even within 1mm of their claimed geometry. That 1mm will make the difference between good tension, and no tension.

- Joel
GarthMc
03-16-2006, 03:42 PM
I doubt very much that the chainstay measurements are even within 1mm of their claimed geometry. That 1mm will make the difference between good tension, and no tension.

- Joel

True that, as well as all my gear being rather well bedded in so I doubt the links in the chain are exactley 1" any more.