scale

i have an older sugino mighty comp crankset on my single gear. The chainrings were either a 52 or a 48 i believe.

I kept the 48 and started with a 17t freewheel in the back. I started to have knee issues so i switched to a 18 in the back. it didnt help much.

My question is can i go to a smaller chainring up front.....say a 42? I think it is 144 BCD but im not sure.

i havent found much for options on this crankset.

TejanoTrackie 

Yes, the old Sugino Mighty Compe is 144 BCD and the smallest chainring that will work is 42T (actually TA still makes a 41T that will work but have to do some filing of the crank spiders to provide chain clearance). You can find Sugino Messenger chainrings in 42T and 144 BCD.

1fluffhead

BREV. FYXOMATOSIS

Yo!

I found a 42 MC ring used cheap after I blew up my knee. They're out there.

scale

cool. I wasnt sure if the messenger zen would be correct or not.

I guess im running a 46 now....not a 48 as previously reported. My question now becomes.....at 70+ dollars a chainring do i go down to 44 or all the way down to 42.

I have to image you notice changing teeth count on the front ring alot more than the rear. Going from a 17t to a 18t on the rear didnt feel like much of change. I didnt notice it at all

Yo!

Well, one tooth on the cog will be more noticeable than one on the chainring.

It's a 1:2 tooth ratio when dealing with differences between cog/chainring. Moving to from a 17t to an 18t is essentially the same as going from a 48t to a 46t chainring.

scale

ah....so going from 46x17 to 46x18 woudl then essentially bring my front chainring to 44.

if i dump my front ring to 44 it woudl be the same as putting a 19 in the rear.

Maybe that would be easier.


Probably cheaper if i can find a 19 tooth freewheel.

I assume all gearing ratios dont matter. WE are probably talking about gear inches in the end. so if the gear inches = the same number in the end that is the goal.

deathhare

Not true. A lot of these are 151 BCD and fewer seem to be 144 BCD.
The poster should make sure of what they have before buying a chainring.

W!LL

Yeah it makes more sense to get a larger cog. You can use this (https://software.bareknucklebrigade.c...it.applet.html) to figure out gear inches and everything.

TejanoTrackie 

I think the Sugino Mighty Compe is strictly a road crank; I have several from the 1970's and they are 144 BCD, and basically copies of the Campy Nuovo Record cranks of the day. I also used to own a 1972 Fuji Finest that came with a 144 BCD Sugino Mighty Compe double road crank. Only older Campy Pista track cranks were 151 BCD (I have one). I have never seen a Sugino track crank in 151 BCD.

scale

according to the calculator im pushing 67.2 gear inches currently. I wouldnt think that is too hard on the knees. my cadence is usually 70+.

I think if i rode a bit more at a higher cadence using a larger cog i might get built up to where i can drop to a 17t in the rear and be close to 70 gear inches. I dont much care about speed. Right now i just like to cover long distances and by that i mean 20+ miles without my knees complaining for days afterwards. IM fooling with cleat position lately to try and sort it out. Funny thing is i rode the trainer a couple times a week doing intervals on my normal road bike (3minutes flat out...followed by 3 minutes of soft pedaling....SUFFERFEST). THat didnt seem to affect me at all. Knees felt fine......

damnest thing.....
my saddle height is the same. My ss has a more agressive seat post angle that my road bike. My road bike is actually way too big for me...but oddly i dont get the issues i get on my ss. I enjoy the ss much more. Less drive train noise, fits me better, etc.

if i could find a road bike exactly like what i have (exact frame) in my size id snap it up and ride that. No luck yet. Ive been looking for about 6 months and nothing. Watching craigs i see a few posted around the country here and there but 9 times out of 10 nobody will ship no matter how much i pay for shipping or packing. Ebay is way over priced especially since sping has hit. IM not giving up though.

I figure maybe a faster cadence is all i need on my ss and my issues will go away. I should spring for the fitting and probably will once i find the road bike i want.

clubman 

Sorry for the crappy pic. This is my Mighty Comp track 151 bcd from the early to mid 70's. I have 48 and 47 tooth rings for it. They emulated Campag back in the day too.

This one is anodized black too...haven't seen another like it

Attachment 148406

TejanoTrackie 

Interesting. Where do you live? I don't recall ever seeing these in the USA.

clubman 

I'm in Canada but I got them on this Centurion track bike. Slap me because I sold the frameset. One day I'm rummaging through a box in a used bike/junk shop in Toronto and I find an NOS 47 tooth Mighty Comp 151 1/8" ring to match...for $20.

Somedays you live right.

Attachment 148408

Look here...still for sale? https://tinyurl.com/33d4nnr

deathhare

I've seen tons of these track cranks in 151BCD.

norskagent

I have an old sugino mighty track crank, 151bcd. Length is 171mm!

veganwar

I have two sets of the Mighty Comp track cramks in 151 bcd sitting in my parts box. One set came on my early/mid-70s Paris Sport track bike while the other set I bought on ebay last year, thinking that they were 141. I've also got a black 151 mighty comp chainring. An ex roommate worked at a shop, the shop owner had several 151 rings sitting around and sold them to my friend for $20 (for all the them, not individually). The ex roommate sold them to me for the same price a year later.