Stupid question about 1/8" chain on 3/32" gears
#1
fair weather cyclist
Thread Starter
Stupid question about 1/8" chain on 3/32" gears
Well I am an idiot - I bought a bike from BikesDirect and never bothered to check what they gave me. They told me 3/32" and I finally measured it (after buying 2 3/32" cogs and a 3/32 chainring) and both chain and DA 49t are 1/8".
Question is how much trouble will I get in racing on a 1/8" chain on 3/32" gears, aside from some side to side slop...
Question is how much trouble will I get in racing on a 1/8" chain on 3/32" gears, aside from some side to side slop...
#2
Senior Member
Join Date: Jan 2005
Posts: 3,170
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 43 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Generally fine. I have a random assortment of 1/8 and 3/32 cogs and chainrings and just use 1/8 chains. just check your chain tension and make sure you can't derail the chain with the side of a wrench.
#3
Elitist
Join Date: Jul 2005
Location: Atlanta, GA
Posts: 15,965
Mentioned: 88 Post(s)
Tagged: 0 Thread(s)
Quoted: 1386 Post(s)
Liked 92 Times
in
77 Posts
I'd suggest buying 1/8" from here on out...unless you have a particular preference for 3/32". Most track-specific gear (cogs, chains, chainrings) comes in 1/8" with only a few manufacturers offering 3/32" as well. Plus it's easier to borrow stuff in a pinch if you are on 1/8". You can borrow 3/32" or 1/8".
That being said, I know of a few people that are on 3/32 cogs, chainrings, and chains. I would assume that they have specific reasons for choosing them.
I would assume that you bought the Motobocane Team Track (which is a nice bike). I would venture to guess that they chose to use 3/32" in the spec because they got 3/32" parts for less than 1/8" being that it's less popular which keeps the price down. But, that's all speculation. You are sort of lucky to get a 1/8" Dura Ace chainring.
That being said, I know of a few people that are on 3/32 cogs, chainrings, and chains. I would assume that they have specific reasons for choosing them.
I would assume that you bought the Motobocane Team Track (which is a nice bike). I would venture to guess that they chose to use 3/32" in the spec because they got 3/32" parts for less than 1/8" being that it's less popular which keeps the price down. But, that's all speculation. You are sort of lucky to get a 1/8" Dura Ace chainring.
Last edited by carleton; 07-24-11 at 02:56 PM.
#4
Senior Member
Join Date: Jan 2005
Posts: 3,170
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 43 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Modern 3/32 chains are nice if you have to live with a terrible chainline-- most of them are made to be used with geared bikes. 3/32 will be a tiny bit lighter, so in principle you can spin it up faster, but the difference is not likely to be noticeable by anyone. And like you say -using 1/8" chain means you can borrow rings and cogs from pretty much anybody. There's also no particular reason anymore to work hard to make your bike light-- it's pretty easy these days to end up under the 6.8 kg limit without going to any effort at all.
#5
fair weather cyclist
Thread Starter
OK I see what happened. They gave me a 1/8" chain with 1/8" 49t and 1/8" 15t, but told me it was 3/32" and then they threw in a DA 3/32" 16T cog too... very odd. So I ordered myself a 14t and a 51t in 3/32". I'll figure something out. Heh. Unfortunately my combinations for 1K and 3K this week both include either a 14t or a 51t. My main concern was whether this is going to cause any problems (chain falling off or something). I can see a little side to side slop.
#6
Elitist
Join Date: Jul 2005
Location: Atlanta, GA
Posts: 15,965
Mentioned: 88 Post(s)
Tagged: 0 Thread(s)
Quoted: 1386 Post(s)
Liked 92 Times
in
77 Posts
Well there is this article about Sarah Hammer:
https://velonews.competitor.com/2011/...march-2011-102
I'm not sure I'd agree with the "Like most endurance athletes..." part. But, Casey Gibson would certainly know more than I would. He's seen more world-class bikes up close than many.
Main article: https://velonews.competitor.com/2011/...elt-tk1_165893
The others that come to mind were on the Cox Atlanta Velo team from the 90s or early 2000s. The 2 that I know of that are still racing use 3/32" because that's what their coach put them on. One is a male endurance track specialist. The other is a female all-around racer. Both national-level masters now.
Hammer rides with an Octalink SRM to record her performance. Like most endurance athletes she rides with a 3/32″ “road” pitch chain and chainring. Also noticeable is a large pedal washer on her Shimano SPD-SL pedal.
I'm not sure I'd agree with the "Like most endurance athletes..." part. But, Casey Gibson would certainly know more than I would. He's seen more world-class bikes up close than many.
Main article: https://velonews.competitor.com/2011/...elt-tk1_165893
The others that come to mind were on the Cox Atlanta Velo team from the 90s or early 2000s. The 2 that I know of that are still racing use 3/32" because that's what their coach put them on. One is a male endurance track specialist. The other is a female all-around racer. Both national-level masters now.
#7
Elitist
Join Date: Jul 2005
Location: Atlanta, GA
Posts: 15,965
Mentioned: 88 Post(s)
Tagged: 0 Thread(s)
Quoted: 1386 Post(s)
Liked 92 Times
in
77 Posts
OK I see what happened. They gave me a 1/8" chain with 1/8" 49t and 1/8" 15t, but told me it was 3/32" and then they threw in a DA 3/32" 16T cog too... very odd. So I ordered myself a 14t and a 51t in 3/32". I'll figure something out. Heh. Unfortunately my combinations for 1K and 3K this week both include either a 14t or a 51t. My main concern was whether this is going to cause any problems (chain falling off or something). I can see a little side to side slop.
1) You will be fine racing 3/32" cog and chainring on a 1/8" chain.
2) If you really want peace of mind, can you borrow a 51t and 14t from some friends or local trackies? (assuming that you are going to Masters Nationals this week)
#8
Senior Member
Join Date: Jan 2005
Posts: 3,170
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 43 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
But I'd agree that the "most endurance athletes" is probably a bit of an overstatement.
#9
fair weather cyclist
Thread Starter
thanks... I think i'll be good. Seems a little sloppy side to side but otherwise OK. I will be there tomorrow and Wednesday. Good luck.
#10
Senior Member
Join Date: Jul 2010
Location: Michigan
Posts: 4,863
Bikes: too many of all kinds
Mentioned: 35 Post(s)
Tagged: 0 Thread(s)
Quoted: 1147 Post(s)
Liked 415 Times
in
335 Posts
On rare occasions doing something like a flying 200 I have heard of the chain coming off when running the thinner cog (slightly worse with steel frames). Some people strongly recommend against it, some say its no big deal. Obviously it is not optimum, but there is a very small risk of the chain coming off. Generally not too much of a safty issue, but it does take a while to come to a stop if you are doing over 30mph.
Its not a stoopid question. ;-)
Its not a stoopid question. ;-)
#11
Senior Member
Join Date: Jul 2010
Posts: 1,014
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
This thread made me curious so I went and took a measuring tape to my Dura-Ace drivetrain which was originally on a Team Track. Mine is also 1/8th, but I've been running a 3/32 cog from the day I got the bike with no issues. This is good news, I can now buy the cool kid chains and cogs!
#12
Senior Member
If your chainline isn't good, I'd highly suggest getting a 1/8th inch cog. I modified my track bike to do a single speed crit one time this year. The only SS freewheel that was available to me was for 3/32nds. My chainring and chain were 1/8th. Ended up dropping out of the crit when the chain came apart.
Not the chain's fault; I had been using that chain at the velodrome for a while and it was in fine shape. I believe the chainline was off enough that on one revolution, the chain sideplate caught on the tip of one of the thin cog teeth and the pivot pin was dislodged. It was a bit scary; fortunately, when the chain broke, it came off cleanly and I didn't lose control of the bike.
Not the chain's fault; I had been using that chain at the velodrome for a while and it was in fine shape. I believe the chainline was off enough that on one revolution, the chain sideplate caught on the tip of one of the thin cog teeth and the pivot pin was dislodged. It was a bit scary; fortunately, when the chain broke, it came off cleanly and I didn't lose control of the bike.
__________________
Cat 2 Track, Cat 3 Road.
"If you’re new enough [to racing] that you would ask such question, then i would hazard a guess that if you just made up a workout that sounded hard to do, and did it, you’d probably get faster." --the tiniest sprinter
Cat 2 Track, Cat 3 Road.
"If you’re new enough [to racing] that you would ask such question, then i would hazard a guess that if you just made up a workout that sounded hard to do, and did it, you’d probably get faster." --the tiniest sprinter
Thread
Thread Starter
Forum
Replies
Last Post
brianinc-ville
Bicycle Mechanics
4
07-03-14 10:57 AM