j814wong

https://www.amazon.com/Vuelta-8150033...le+crankset+52

Here is my bike. https://www.bikesdirect.com/products/...liberty_cx.htm
I've changed the cassette to a Shiimano-compatible SRAM PG850 8SP 12-26 cassette. I'm looking to replace my crankset which has two inner chainrings I think I bent because the chain gets stuck between teh lowest and middle chainring when the chain on teh lowest chainring. When pedalling, the chain only gets stuck in a certain spot. I've tried to bend it back into place and will test it out tomorrow. But it this doesn't work, work the above Vuelta Corsa Crankset work on my bike?

Would an Ultegra 30T inner chainring fit? What about the 42T one?
https://www.amazon.com/Ultegra-FC-650...=cm_cr_pr_pb_t
https://www.amazon.com/Ultegra-FC-650...=cm_cr_pr_pb_t

Should I siply get an entire matching crankset? For the price of both chainrings, I can get the full Vuelta Corsa Pro Crankset.

Andrew R Stewart 

While there's no requirement for non S brand cranksets to have the same ring C-C dimensions (which are a big determinate for index shifting) the market place pretty much wants it. So i suspect that the vuelta is S compatible in this aspect. next concern is the ring sizes and their differences. S brand ders like both certain ring sizes and the amounts of teeth count differences from ring to ring. The shapes of the frt cage is designed around this. So the Vuelta having the same ring sizes is a good thing.

What does change though is the ring tooth profiling, shift gate shape and lift pin designs. Here's where S brand has it over most all other companies. S has done to most extensive research and design over many years to insure the best shifting (within the design specs). Other companies, that are common even as OEM parts, don't have as nice front shifting. But since rider technique is an even bigger factor a well schooled rider can shift second rate designs better then a klutzy rider shifting a Shimano crankset.

As to the 30T ring interchangeability, they are likely so. Both the S and the no name inner ring likely use the 74mm bolt pattern. But one measurement is worth a thousand opinions. The bolt to bolt dimension for a 74 mm circle is 43.5mm. Andy

mbrraleigh

I actually bought that same bike recently to fix up as a commuter. My impression when the bike arrived was that the original crankset was the weakest component on the bike. The middle chainring was indeed already bent on the one I purchased (a manufacturing defect) and if, I remember correctly, there weren't even ramps and pins to to improve shifting. I would just get a different crankset if you are certain the problem is due to a bent chainring and not a simple cable adjustment. I certainly wouldn't bother replacing chainrings on such a basic crankset. I replaced mine with a Shimano FC-2303 which essentially is in the same parts group as the front derailleur so it ended up working fine as Andrew's post suggests. I did have to change the bottom bracket as well which I was happy to do anyway. I suspect the Vuelta crankset should work if you want to go that way. Just make sure you use the proper bottom bracket.

Mitch

techsensei

I'd suggest the FC-2300(03) over the Vuelta. It will shift better because of the integrated designing/engineering Shimano does that Andy spoke of.

fietsbob

Too absorbed by brand names are we? TV does that.. its the Advertising..


going to dimensions ..
Bicycle chains standardized on 1/2" pitch and so any chainring of the same tooth count will be the same diameter.

the other data point is chainring bolt circle diameter..

a 74 bcd 5 bolt chainring is interchangable with any other of same data.

dont think there are 42t 74mm bcd chainrings


FD just shove the chain sideways off the chainring to another .. de rail ing.

techsensei

One thing is certain: the only thing "pro" about the Vuelta is the name.

fietsbob

is it a 130 BCD and a74 Bcd granny ?, IDK.


well "Vuelta" being the Spanish TdF, last of the 3 grand Tours. in the year. its a name..

The Rotor brand is at least a Spanish company ..https://www.rotorbike.com/company/history

but the OP is wanting low cost, not Pro cost.


what you need to set up is the chainline , so the planes []lets say the tooth tips,
of the chainrings and the rear cluster line up..


Maybe Bikes Direct service department will know all this, after all Its their Bike.

j814wong

Yep. I'm replacing my crankset. I bent it back straight but now, it bent back into it's bent position. What junk... time to visit my LBS

HillRider

When was the last time you saw a Shimano ad on TV? Brand names imply an expected level of quality and reliability and the manufacturer has a strong incentive to maintain the consumer's trust. Shimano, Campy, SRAM and others have done that. "Vuelta"? Not so much.

fietsbob

there are several makers of aftermarket chainrings .. Vuelta is one such Brand

I dont even think they're spanish, just borrowed the Word.

And They may have an Asian contract company making stuff for them IDK.
It's a common Business Practice. these Days..

the whole thing about the Whole crankset A is it Just like Crankset B .

Never seen them in the flesh, Bring them Both over and I'll look at them ..

.. some Improvisation is useful in Repairs.

all else you may have to get a new BB in a different length, they UNxx are cheap too.
if the new arms dont sit on the old spindle like the prior one did.

OP is on the right track hard to get service questions answered By Amazon. they just ship.