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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 04-24-10, 09:56 PM   #1
Thrahl
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Wanting to Replace Crankset - What's Involved?

I bought the nashbar hounder (info here) a little over a month ago and have been slowly upgrading piece by piece.
So far I have changed out the bars, stem, brake levers, and put clips on it and I am really liking it.

But I now would like to upgrade the crankset for a few reasons:
1.) I would like shorter crank arm. The ones I have now are I believe 170mm and I would like to go down to 165mm.
2.) I would like to try out a slighter higher gear ratio. I currently have 42x16 but am curious what a slightly larger 46x16 is like.
3.) I want a black crankset. My current one is black arms w/ silver ring.

Basically, my only problem is money. The new ones need to be cheap.
I saw these posted in another thread and they seem to be exactly what I am looking for.


My main question is what is involved in switching cranks?

Will I have to get a new bottom bracket? (If so, is it possible to adjust chainline with different length bbs?) (Also, I believe this bike has the same bb as the SE Draft if that helps)

I plan to buy the stuff online and have it installed at the bike shop simply because I don't have the proper tools.

Thanks for any help.

Last edited by Thrahl; 04-24-10 at 11:11 PM.
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Old 04-24-10, 11:11 PM   #2
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Originally Posted by fixiefanatic View Post
You will need to get a new crankset, bottom bracket, stem, wheels to handle the extra stress, and some new pedals. Hope this helps and good luck!
I can't tell if your trying to be sarcastic or not but I highly doubt changing my cranks is going to make my rims explode so...
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Old 04-24-10, 11:25 PM   #3
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You'll need a crankset and a bottom bracket. If your current one has an american bottom bracket, you'll need an adapter.

The eightinch ones will work fine. Be sure to get the correct bottom bracket [68x103].
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Old 04-24-10, 11:31 PM   #4
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First of all, your choice of crankset is fine.

The cranks on your bike, from what I understand, are some sort of BMX type. Specifically, you have what the BMX guys call "Euro" bottom bracket. More info here:
http://www.danscomp.com/install/Pove...nk_Install.pdf
It's a particular splined interface bottom bracket. you can only find BMX chainrings and BMX cranks for such a bottom bracket. Square taper (the most common type of crank interface, the one your choice of crankset uses as well) won't fit on that BB. The good news is, Euro BMX bottom brackets (from what I understand) are the same size as 68 mm BSA, so you can replace your BMX BB with a standard square-taper, such as this Sugino

While replacing the standard stuff is easy and I'd suggest you get the tools (BB puller and crank puller), the BMX stuff is more exotic, and you'd need it only one time in your life - therefore, it's better have it done by a well-equipped LBS.
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Old 04-24-10, 11:31 PM   #5
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Alright, forget whatever fixiefanatic said.

A new crankset is probably going to involve getting a new bottom bracket. Most cranksets tell you what spindle length your bottom bracket should be for a proper chainline.

Example: When I switch from miche primato cranks to Campy Record Pista cranks, I got a new bottom bracket because the spindle length for the Campy had to be 111mm and the Miche was 107mm.

So unless you can find a crankset with the same requirement for a bottom bracket, you will need a new one.

The cranks you linked to require a BB with a 103mm spindle so this bottom bracket would work out.
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Old 04-25-10, 08:04 AM   #6
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Quote:
Originally Posted by wroomwroomoops View Post
First of all, your choice of crankset is fine.

The cranks on your bike, from what I understand, are some sort of BMX type. Specifically, you have what the BMX guys call "Euro" bottom bracket. More info here:
http://www.danscomp.com/install/Pove...nk_Install.pdf
It's a particular splined interface bottom bracket. you can only find BMX chainrings and BMX cranks for such a bottom bracket. Square taper (the most common type of crank interface, the one your choice of crankset uses as well) won't fit on that BB. The good news is, Euro BMX bottom brackets (from what I understand) are the same size as 68 mm BSA, so you can replace your BMX BB with a standard square-taper, such as this Sugino

While replacing the standard stuff is easy and I'd suggest you get the tools (BB puller and crank puller), the BMX stuff is more exotic, and you'd need it only one time in your life - therefore, it's better have it done by a well-equipped LBS.
Awesome, that helps a lot. I will most likely be going down to the shop Monday or Tuesday to get them to check it out and see their crank and bb selection while I'm there.
Is it bad manners to get them to check it out, then buy it online, then get them to install it? (since I probably wouldn't be buying from them)

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Originally Posted by zachdluchs View Post
Alright, forget whatever fixiefanatic said.
The cranks you linked to require a BB with a 103mm spindle so this bottom bracket would work out.
Thanks for that link, all the 68x103 I was seeing were costing upwards up $30 and that kind of sours the deal on the cranks but this one is nice and cheap

Last edited by Thrahl; 04-25-10 at 08:07 AM.
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Old 04-25-10, 08:11 AM   #7
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Originally Posted by Thrahl View Post
Awesome, that helps a lot. I will most likely be going down to the shop Monday or Tuesday to get them to check it out and see their crank and bb selection while I'm there.
Is it bad manners to get them to check it out, then buy it online, then get them to install it? (since I probably wouldn't be buying from them)
No, because them checking the BB will take almost exactly 13.8 seconds. Heck, I did most of the "legwork", and I don't expect a dime

EDIT: while you're at that LBS, make damned sure that they DO have the tools necessary to pull the cranks and the Euro BMX BB out (that's why I said "well-equipped LBS).

Last edited by wroomwroomoops; 04-25-10 at 08:14 AM.
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Old 04-25-10, 08:27 AM   #8
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Originally Posted by wroomwroomoops View Post
No, because them checking the BB will take almost exactly 13.8 seconds. Heck, I did most of the "legwork", and I don't expect a dime

EDIT: while you're at that LBS, make damned sure that they DO have the tools necessary to pull the cranks and the Euro BMX BB out (that's why I said "well-equipped LBS).
My local lbs is very small (though i can get to much larger ones by car) and are probably not "well equipped".

However, after looking around a bit, it seems that this "euro" bb is really just a standard British/ISO bb (euro is the bmx slang term according to Sheldon).

So even my small shop should have the tools to take it out or I could just get them online.
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Old 04-25-10, 08:35 AM   #9
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Originally Posted by Thrahl View Post
My local lbs is very small (though i can get to much larger ones by car) and are probably not "well equipped".

However, after looking around a bit, it seems that this "euro" bb is really just a standard British/ISO bb (euro is the bmx slang term according to Sheldon).

So even my small shop should have the tools to take it out or I could just get them online.
As I stated in my original post, the BB shell size is (or should be) compatible with a BSA 68 mm BB. That only means that you can fit a standard 68 mm BSA BB into the BB shell of your bike. But the problem of pulling the Euro BMX BB from your bike's BB shell still remains. Look at the .PDF file I linked to: it contains pictures of the Euro BB-specific tools.
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Old 04-25-10, 09:06 AM   #10
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Originally Posted by wroomwroomoops View Post
As I stated in my original post, the BB shell size is (or should be) compatible with a BSA 68 mm BB. That only means that you can fit a standard 68 mm BSA BB into the BB shell of your bike. But the problem of pulling the Euro BMX BB from your bike's BB shell still remains. Look at the .PDF file I linked to: it contains pictures of the Euro BB-specific tools.
OK I think I understand now. I was a little confused.
I actually didn't realize that I could replace the chainring that's on their now, but from what I have seen, most are very small sizes, usually less than 35 teeth.
I could also get an adapter from bmx chainwheel to road chainring but they aren't very cost effective.

Thanks for your help.

EDIT: actually, on ebay there are some good bmx chainwheel prices but they say they are for one piece cranks. Would they work for my cranks?
for example this one

Last edited by Thrahl; 04-25-10 at 09:11 AM.
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Old 04-25-10, 12:04 PM   #11
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I have a set of the Eightinch cranks, and my only complaint is that they're not aesthetically pleasing due to the fact that the 170mm and 165mm are the same arms, just drilled differently. For the same price, the Tec9 cranks seem to be nicer looking, even if they probably come from the same factory.
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