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What crankset to get for old Nishiki?

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What crankset to get for old Nishiki?

Old 04-23-21, 09:29 PM
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helfrederick
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What crankset to get for old Nishiki?

Hello,

I have an old 12-speed nishiki. The front two chainrings got bent during a recent ride. The cassette is also quite old...some of the numbs are several millimeters shorter.

I'm a complete newbie at bike repair and could use some advice.

If I want to replace both chainrings, the cassette, and the chain, what is the most affordable way to do this? How do I know what sizes to buy....do I just count the teeth? The chainrings are 52 and 42. The cassette goes from 24T to 14T.

Also, the front wheel is quite old and not true...

I'm headed to Seattle in July for a touring/camping trip with 30-40 mile rides.

Thank you!
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Old 04-23-21, 09:36 PM
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Depending on the age, Sugino AT is a crowd favorite for a high range triple easy to find chainrings.

My personal favorite for a Japanese bike is the SR Apex. Not too hard to come by, and the 86 bcd ones can give you some good options for a compact double.
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Old 04-23-21, 09:40 PM
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need to know if it's actually a cassette or a freewheel. either type of gear can be had pretty cheap on ebay, from a bike forum member (perhaps), or many online retailers. i always go to ebay.
chains can be acquired there, too. i just picked up three sram 8spd chains for less the $9 a pop.
and, chainrings....need to know what crank you have to determine the bolt circle diameter. that would be how far apart the chain ring bolts are. it can range from 110mm to 144mm, typically
as for the front wheel, if the spokes where they run into nipple/rim are not corroded too bad, any bike shop would be able to straighten it up. if there's corrosion, you can get them turning free with some penetrating fluid and then take it to a shop
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Old 04-23-21, 10:43 PM
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Welcome to BikeForums helfrederick! How badly bent are the rings? It may be possible to straighten them.
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Old 04-24-21, 07:06 AM
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also, it's possible that some teeth on your rear freewheel are intentionally shorter than others, one of the ways that designs evolved to improve shifting performance.
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Old 04-24-21, 08:18 AM
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The gearing on this bike (52/42 rings and a 14-24 rear cluster) isn't great for a touring/camping trip in the Pacific NW with 30/40 day rides.

A 110/74 bcd triple (that is a common design) will help but that means that you will need a new bottom bracket, a different rear derailleur, perhaps a different front derailleur, and a new chain.

The rear is likely a freewheel since it has 6 speeds. A 14-28 freewheel will be a big help.
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Old 04-24-21, 08:35 AM
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I'm a complete newbie at bike repair and could use some advice.
Based on that statement, I would change only what needs to be replaced. Going to a triple, as opposed to a double, ring set will most likely necessitate the changing out of the bottom bracket(not a task for the uninformed). So...

Look for a set of crank rings, 52-42 is not the best for touring but will work just fine, in my opinion. You will also need to know the distance between ring bolt centers. There are different ring bolt circle measurements but measuring from one to an adjacent one will get you ballparked (report that measurement here and ask for bolt ring diameter size).

Armed with those two pieces of information, you should be able to find what you seek and what you find will, most likely, fit your crank and work well enough for your intended purpose. Also, for the uninformed newbie, just changing out the rings is well with-in the average person's ability.

There is an alternative, depending on how bent your chain rings are. If not too bad, just take the time to straighten them out. When doing this, I measure from a reference point on the seat tube, at the height of the ring. Small bends will be the process until the crank ring is fairly straight. Try not to over bend. Too much bending will result in metal fatigue and failure. I should add that I have straighten out lots of crank rings, alloy or steel, over the years and with more than acceptable success.

Hope that is a help.
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Old 04-24-21, 11:13 AM
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Are these Shimano cranks? The back of the crank arm should have the model number on them. these are still available new from Ebay:

https://www.ebay.com/itm/391952215070

itís best to buy chain rings in matched sets for best shifting.

The 6 speed rear cluster is probably a freewheel and not cassette. Very plentiful and cheap on Ebay.
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Old 04-24-21, 11:29 AM
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Originally Posted by bikemig View Post
The gearing on this bike (52/42 rings and a 14-24 rear cluster) isn't great for a touring/camping trip in the Pacific NW with 30/40 day rides.

A 110/74 bcd triple (that is a common design) will help but that means that you will need a new bottom bracket, a different rear derailleur, perhaps a different front derailleur, and a new chain.

The rear is likely a freewheel since it has 6 speeds. A 14-28 freewheel will be a big help.
Even more reason to look for an 86 bcd SR Apex crankset. Cheap, "correct", no bottom bracket replacement, low gearing.
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Old 04-24-21, 11:49 AM
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Originally Posted by jPrichard10 View Post
Even more reason to look for an 86 bcd SR Apex crankset. Cheap, "correct", no bottom bracket replacement, low gearing.
The same is true with a 110/74 bcd crank if you run it as a compact double and it's much easier to find 110 bcd rings.
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Old 04-24-21, 11:59 AM
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Originally Posted by bikemig View Post
The same is true with a 110/74 bcd crank if you run it as a compact double and it's much easier to find 110 bcd rings.
I must not know how to do this, because I tried to replace a double with a Sugino AT but the small chainring still hit the chainstays. Or are you just using the 110bcd rings? In which case there's a lot of options for just 110bcd.
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Old 04-24-21, 12:09 PM
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Originally Posted by jPrichard10 View Post
I must not know how to do this, because I tried to replace a double with a Sugino AT but the small chainring still hit the chainstays. Or are you just using the 110bcd rings? In which case there's a lot of options for just 110bcd.
I meant running it as a double.
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Old 04-24-21, 01:52 PM
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With a 14-24 freewheel, this was probably sold as an entry-level racing bike, which may not be good for touring. How much weight do you plan to carry? Do you already have panniers, or do you plan to pull a trailer?

Do you know when your bike was made? If it's from the '70s, it might have a Campy-copy crankset, and 41/42 may be the smallest ring you can fit unless you get a 'tripleizer' - https://www.redclovercomponents.com/...riplizers.html.

What sort of terrain is between you and Seattle? This bike is not set up for hills. You can change gearing, but in all likelihood, getting gears for riding up mountains means a triple, and that means finding the right BB axle. A compact double (one big and one small chainring - like a 50/32) with a 6 or even 7 speed freewheel means big jumps between gears. A compact double is eminently doable for 30-40 mile days, but a triple (52/49/26, for example) is likely to be a lot better.

Is your bike set up with 121 mm or 126 mm between the dropouts in the rear? If 121 mm, you need either a 5 speed or Ultra-6 freewheel, and Ultra-6es are rare. If it's 126 mm, you can probably fit a 7 speed freewheel - something like this: https://www.amazon.com/Shimano-TZ500...9293544&sr=8-6 (you might find it for less from another seller.)

IOW, replacing the chainrings could be a can of worms.

Last edited by philbob57; 04-24-21 at 02:10 PM.
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Old 04-24-21, 05:06 PM
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Originally Posted by thook View Post
and, chainrings....need to know what crank you have to determine the bolt circle diameter. that would be how far apart the chain ring bolts are. it can range from 110mm to 144mm, typically
Thanks!

I bought a 144mm chainring and it lines up with the old one....so that seems to be what I have.

Does the cassette/freewheel also have to be 144mm or does it have it's own measurement?
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Old 04-24-21, 05:19 PM
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Originally Posted by philbob57 View Post
With a 14-24 freewheel, this was probably sold as an entry-level racing bike, which may not be good for touring. How much weight do you plan to carry? Do you already have panniers, or do you plan to pull a trailer?

Do you know when your bike was made? If it's from the '70s, it might have a Campy-copy crankset, and 41/42 may be the smallest ring you can fit unless you get a 'tripleizer' -

\
I used it 5 years ago to bike from Crescent City, CA to Los Angeles and it was fine on the hills. No panniers or trailer....just bungee cords

It's a nishiki prestige....I think from the 80s just because it's not too heavy, with a black and cream frame.
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Old 04-24-21, 05:31 PM
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Originally Posted by icemilkcoffee View Post
Are these Shimano cranks? The back of the crank arm should have the model number on them. these are still available new from Ebay:


iTís best to buy chain rings in matched sets for best shifting.

The 6 speed rear cluster is probably a freewheel and not cassette. Very plentiful and cheap on Ebay.
Thank you! I think my chainrings are 144 BCD. I'm not seeing any shimano's with the 144BCD 52x42 teeth, but I do see some other brands.

There are no labels on my crank arm, so probably not shimano.
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Old 04-24-21, 07:19 PM
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Reasonable hunch that a new freewheel will push a new chain- not terrible but will require an ď8 speedĒ chain and chain tool, a bigger large rear freewheel cog (28) will also prob want a longer chain.

If there is a bike Co-op accessible- that will help.
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Old 04-24-21, 08:02 PM
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Originally Posted by helfrederick View Post
Thanks!

I bought a 144mm chainring and it lines up with the old one....so that seems to be what I have.

Does the cassette/freewheel also have to be 144mm or does it have it's own measurement?
around here, folks will distinguish between a cassette and freewheel so there's an accurate basis of discussion surrounding the part since there distinct differences. sounds like you have a freewheel. and, no....there's no correlation to the freewheel and the bolt circle diameter of the chain rings/144mm. iow's, the two are exclusive of each other. any spin on freewheel will work on your rear wheel. the question is what gear range of the freewheel your rear derailleur will shift. short cages generally run up to a 28 tooth large sprocket while long cages will go up to 32 teeth. some will handle 34. it will depend on what derailleur you have. supply that info and you will get needed recommendation
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Old 04-24-21, 08:06 PM
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Originally Posted by philbob57 View Post
and 41/42 may be the smallest ring you can fit .....
i recall 39t being the smallest possible ring on a 144mm bcd. google would answer, but i'm being lazy tonight
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Old 04-24-21, 08:14 PM
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Originally Posted by thook View Post
i recall 39t being the smallest possible ring on a 144mm bcd. google would answer, but i'm being lazy tonight
41 on 144bcd, 38 on 130bcd.
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Old 04-24-21, 08:30 PM
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Originally Posted by C9H13N View Post
41 on 144bcd, 38 on 130bcd.
and, there you have it...ha
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Old 04-24-21, 08:30 PM
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If you need lower gearing, the cheapest, easiest solution is a long-cage rear derailleur and a larger freewheel. 42/32 or 42/34 would give you a decent low gear. Consider going half-step, with something like 47-42 or 46-42 up front and 13-32 in back.
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