help with chainring sizes... ?
 

I need to buy a 50t chainring for my Mercier track bike.. it currently has the highest quality ebay truvativ crank-set and stock 48t chainring available...


I have been looking on ebizzle and other sites and i've come across plenty of matches but I'm afraid of buying the wrong size chainring.....

The chainring from my roadbike-FG conversion is not the same size as on the truvativ crank..

So let me get to the damn question: What size is the truvativ track chainring ?


Thanks !

By size do you mean BCD?
If so, I'd assume it's 130bcd.

http://www.sheldonbrown.com/images/measure-bcd.jpg

For a typical five-hole ring, measure two neighboring holes from center-to-center and multiply the distance by 1.7 to get the BCD of the chainring.

i'm not 100% sure, but i'd guess the bcd is 130.

To save you of some of the hard, hard work, just make the measurement seen above. If it comes out to about 76.4mm (3.01 inches), you have a 130mm BCD.

This crankset is a curse.


It is a 130 bcd. Just try and find a 50 t chainring in 1/8 size for less than $ 100.

The only one I've found is the Shimano DuraAce unit... f-ing ripoff.

They've got dozens of 144bcd version of it for under $ 50 new everywhere !!!!!!!!

DAYUM !!!!!!!!

Dubya, help me out on this one willya !

dubya ain't helped nothin' (unless you're filthy stinkin' rich already).

that said, DA isn't bad. both as discordance axis and dura-ace. anyway, i don't know what price you've found it for, but i don't know what choice you have, other than to stick with 48t till you can afford the 50t.

they are over $ 100 just about everywhere.

Why not just get a cog with one more tooth. They are cheaper than a chainring.

eh, (a cog with 1 less tooth).

either they shank you with the cost of a crankset that's 144bcd (sugino 75, campy), or they get you with the cost of the chainring..

Suck it up and buy a 3/32" chainring. Runs quiet if you've got a good chainline.

this is what i was going to suggest...only...you know, one less. but yeah. this is what i would go with.

I tried a 14t and it was too much gear for me.

I could barely move the bike... (I can barely move it as it is lol).

Anyway, I was looking at the chainring that came with the truvativ crankset and I noticed that it is not even a track chainring.. is a regular 3/32 size.

Anyway, if I'm going to bother with getting a bigger chainring, I'm going to get the right size.

Sheesh.

For 130 mm. bolt circle pattern cranks:
* Spécialités TA
Alize Piste 1/8"
+ 40, 42, 44, 45, 46, 47, 48, 49, 50, 51, 52 - $49.50
* Stronglight
Track 1/8"
+ 48 - $47.50
* SUGINO
130J 3/32"
+ 44, 46, 48, 50 - $32.50

http://businesscycles.com/trcomp.htm#chainrings

You are the sex.


Thanks !