1337Joined: 22 Jul 2005Posts: 6705Location: right over
in an attempt to prevent a repeat of my exploderating drivetrain, i'm going to try to be more careful and pay more attention when building up my new drivetrain. does anyone have recommendations for steel non-ramped chainrings? i'm looking at 48-52t. i think i'm moving to 19t in the rear - 50t would be 69 gear inches.
i'm also possibly looking for new cranks and bottom bracket to fix my chainline. sheldon's notes put my rear chainline at ~52.9mm (surly 135mm hub + a new surly or soma cog). is there any straightforward way to suss out the chainline modifier on a pair of cranks without assembling them to a bottom bracket and measuring?
dennyt
Posted: Mon Feb 27, 2006 10:21 am
rocket mechanicJoined: 02 Aug 2005Posts: 2708
I always thought your hub looked wide. Why are you running the MTB hub?
What's the chainline on your cranks right now?
Surly makes stainless steel chainrings.
lantius
Posted: Mon Feb 27, 2006 10:26 am
1337Joined: 22 Jul 2005Posts: 6705Location: right over
i wasn't paying attention when i built the wheel up. this is a common problem i have in life, this not paying attention. it's not actually been that bad, since i've been using it on random crap bikes it's actually been pretty decent to just stretch the frame out a bit and there haven't been any frames where i've had too little axle.
surly only makes their rings up to 38t.
tonight i'm going to re-measure my current chainline and check the bcd on the cranks i'm running as well to see if i can solve it with perhaps a new bottom bracket and standard chainring.
martin
Posted: Mon Feb 27, 2006 10:32 am
Joined: 30 Jan 2006Posts: 712
Why are you shooting for a 50 in front? Why not just run a 38x15? It's not like people rate you based on how big your chainring is :)
the dreaded ben
Posted: Mon Feb 27, 2006 10:35 am
Grumpy GreebJoined: 20 Aug 2005Posts: 5329Location: flavor country
martin wrote:
Why are you shooting for a 50 in front? Why not just run a 38x15? It's not like people rate you based on how big your chainring is :)
i do. if you know what i mean. nudge, nudge. wink, wink.
joby
Posted: Mon Feb 27, 2006 10:36 am
goes to elevenJoined: 25 Jul 2005Posts: 3899Location: The Cloud
It's not the size of your chain ring, it's what you do with it.
lantius
Posted: Mon Feb 27, 2006 10:38 am
1337Joined: 22 Jul 2005Posts: 6705Location: right over
martin wrote:
Why are you shooting for a 50 in front? Why not just run a 38x15? It's not like people rate you based on how big your chainring is :)
ladies love a man with a big chainring!
my take on it was that more teeth = less individual wear. not that i ever own anything long enough for it to wear out.
dennyt
Posted: Mon Feb 27, 2006 10:47 am
rocket mechanicJoined: 02 Aug 2005Posts: 2708
lantius wrote:
this is a common problem i have in life, this not paying attention.
Yeah, I had a bout of that yesterday. Sucks.
Aaron
Posted: Mon Feb 27, 2006 10:58 am
Joined: 25 Jul 2005Posts: 4645
Lee,
You should switch to 1/8" cogs and chainrings. You are a big strong fella and 3/32" is for the little guys like Justin.
I run a 52 x 20 = 70 gear inches. A big chainring and cog will last longer and have less friction in the drivetrain. I can't keep the chicks at bay because of it.
I think you have a 110mm Bolt Circle Diameter crank, but I only took a quick look at your bike on the trailer yesterday. 1/8" x 110mm chainrings are really hard to find. 1/8" x 130mm are easy. I stock them. I also stock 1/8" cogs. Hey, and I still owe you for the barcode project.
lantius
Posted: Mon Feb 27, 2006 11:12 am
1337Joined: 22 Jul 2005Posts: 6705Location: right over
Aaron wrote:
You should switch to 1/8" cogs and chainrings. You are a big strong fella and 3/32" is for the little guys like Justin.
i don't know about 1/8". i tend to follow the wisdom of the surly guys on this one:
surly guys wrote:
1/2x1/8" chains vs. 1/2x3/32" chains. 1/2x1/8" chains suck. Run whatever you want, but bigger isn’t better here. Yeah, they’re wider, but according to manufacturer-supplied data, they’re not stronger and they are definitely not of better quality. Multi-speed drivetrains is where the bucks are at, and chains that work on such drivetrains are where the manufacturers of chains showcase their innovations and developments in quality. The rollers are better, the plates are better, the pins are stronger, and the construction method (riveting procedure) is better on all multi-speed 3/32" chains. I guess if you grind your chainring and chain down the handrail every night at the local pub, a bigger 1/2x1/8 " chain will last longer, but most of us don’t and it won’t.
it seems like 3/32" chain is easy to come by since everybody's got them, i can swipe one off another bike in a pinch (hell, i could make five chains from the recumbent). standards seem like a good thing to me.
Aaron
Posted: Mon Feb 27, 2006 11:16 am
Joined: 25 Jul 2005Posts: 4645
Didn't you learn from your bent cog? That would not have happened with 1/8". Jason broke a chainring last year. That would not have happened with 1/8". Low quality chains? WTF? Check out the SRAM PC-1. It has all the quality of their other chains. When a single speed chain breaks it is usually crash damage or other damage. Multi speed chains need to be extra burly because they get flexed laterally. A 1/8" chain WILL last longer.
But do what you want.
I have 1/8" , so do Jace and Tony. Check our bikes out next time you see them.
lantius
Posted: Mon Feb 27, 2006 11:32 am
1337Joined: 22 Jul 2005Posts: 6705Location: right over
Aaron wrote:
Didn't you learn from your bent cog? That would not have happened with 1/8".
i call shenanigans on this. would it really have not happened? andre also runs 1/8" on his iro, but overall i don't get it. seems like it's such a small thing as to be nothing, except when you get in a wreck and your chain breaks and there's no fixing it because you have to get 1/8" stuff. or if you need to swap wheels around for whatever reason.
martin
Posted: Mon Feb 27, 2006 11:33 am
Joined: 30 Jan 2006Posts: 712
I agree with Aaron on this one. Go with 1/8"
henry
Posted: Mon Feb 27, 2006 1:10 pm
somewhat piggishJoined: 05 Aug 2005Posts: 5415Location: on porch with shotgun
i run 1/8th. but i know nothing about anything so what i do is really irrelevant.
32% more bearing area on the cog and chainrings is a good thing, if you're worried about drivetrain longevity. And, I bet a 1/8 chain is stiffer laterally and less likely to walk the plank.
The cog and chainring will be 30% heavier, all else equal, but the chain won't be much heavier because the side plates stay the same size as with a narrow chain.
Besides, if you're going macro drive, weight isn't an issue.
lantius
Posted: Mon Feb 27, 2006 1:38 pm
1337Joined: 22 Jul 2005Posts: 6705Location: right over
dennyt wrote:
.125 > .094
32% more bearing area on the cog and chainrings is a good thing, if you're worried about drivetrain longevity. And, I bet a 1/8 chain is stiffer laterally and less likely to walk the plank.
the lateral stiffness is a compelling rationale, i.e. that the chain is actually not engineered to rotate side to side.
hey aaron, do you have a pc-1 lying around that you could compare to the data on this chart? i'm intrigued.
as annoying as it will be to have to deal with different dimensions of chain running around it would be worth it to not have my bike hate on me anymore.
dennyt
Posted: Mon Feb 27, 2006 1:47 pm
rocket mechanicJoined: 02 Aug 2005Posts: 2708
Plus, you don't even have to upgrade your chainwhip if you use the rotafixa method.
lantius
Posted: Mon Feb 27, 2006 2:05 pm
1337Joined: 22 Jul 2005Posts: 6705Location: right over
dennyt wrote:
Plus, you don't even have to upgrade your chainwhip if you use the rotafixa method.
it's true. and since my 3/32" park chaintool got eaten by some big ol 3spd chain (once again not paying attention) that problem has been resolved as well.
hey aaron, in stock do you have:
a) 19t 1/8" cog, surly/soma
b) 50t 1/8" steel ring (130bcd?)
c) 1/8" chain
if so, i'll figure out how to come out and perhaps do commerce with you. for my part i'll measure up what i have for chainline needs and what my current cranks are and figure out if i need to replace any of that tomfoolery as well. i'm hoping to be back on the fixie by the thursday ride.
henry
Posted: Mon Feb 27, 2006 2:07 pm
somewhat piggishJoined: 05 Aug 2005Posts: 5415Location: on porch with shotgun
Dean and i will be riding out to Aaron's on the tandem this evening. You can ride the cargo rack again. ;)
What time? I was planning on heading that way too.
lantius
Posted: Mon Feb 27, 2006 2:18 pm
1337Joined: 22 Jul 2005Posts: 6705Location: right over
thirded... fourthed? i have to be in blard at 730, but if abr can hook me up with bits and i can hustle back that would be pretty awesome i reckon. i can leave here at any time.
henry
Posted: Mon Feb 27, 2006 4:06 pm
somewhat piggishJoined: 05 Aug 2005Posts: 5415Location: on porch with shotgun
Ok here's the official plan for the big ABR sneak.
I'm meeting Dean at his office at 5:15.
I will be solo on the tandem.
We will ride the tandem to ABR.
We will then ride the bus home, leaving ABR at 6:30 and arriving in Fremont around 7:10.
Call me if you want me. twozerosix!threesixnine!!zeroninezeroeight
elderJoined: 10 Feb 2006Posts: 594Location: The Bucket
henry wrote:
Ok here's the official plan for the big ABR sneak.
I'm meeting Dean at his office at 5:15.
I will be solo on the tandem.
We will ride the tandem to ABR.
We will then ride the bus home, leaving ABR at 6:30 and arriving in Fremont around 7:10.
Call me if you want me. twozerosix!threesixnine!!zeroninezeroeight
holy shit! someone gave dean an office?!
_________________ putting the gay back into gangsta.
eternalignorance
Posted: Mon Feb 27, 2006 9:45 pm
Joined: 08 Jan 2006Posts: 359Location: Imaginary Places
I have a cubicle.
lantius
Posted: Mon Feb 27, 2006 11:36 pm
1337Joined: 22 Jul 2005Posts: 6705Location: right over
okay, 1/8" it is. i'll report back next year with stats on whether i've managed to destroy it or not.
now to loot andre's shop for the tools and expertise to put this together very correctly.
sekai
Posted: Tue Feb 28, 2006 8:31 am
Joined: 25 Jul 2005Posts: 1466Location: on the lake
lantius wrote:
okay, 1/8" it is. i'll report back next year with stats on whether i've managed to destroy it or not.
now to loot andre's shop for the tools and expertise to put this together very correctly.
good choice! i'm going to go 1/8th some day. i figure there is a reason "real" track bikes run 1/8th. untill then i got a z chain made for single speeds (3/32) i really like the stout feel of it.
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1337
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rocket mechanic
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Grumpy Greeb
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goes to eleven
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