Stupid question about crank bolts?
#1
Stupid question about crank bolts?
So, this may be pretty stupid, but I have never built up a bike from scratch, so bear with me. I just picked up these cranks:
https://www.interlocracing.com/cranks.html
and a corresponding Shimano BB:
https://www.nashbar.com/bikes/Product...3#ReviewHeader
but it seems the cranks have no crank bolts to tighten them onto the spindle. The only other cranks I had were the SRAM s300's and they came with crank bolts. Am I missing something here? Do I just pick up some crank bolts at the LBS? Do cranks usually ship without the bolts?
https://www.interlocracing.com/cranks.html
and a corresponding Shimano BB:
https://www.nashbar.com/bikes/Product...3#ReviewHeader
but it seems the cranks have no crank bolts to tighten them onto the spindle. The only other cranks I had were the SRAM s300's and they came with crank bolts. Am I missing something here? Do I just pick up some crank bolts at the LBS? Do cranks usually ship without the bolts?
#2
Veteran Racer


Joined: Jul 2009
Posts: 11,866
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From: Ciudad de Vacas, Tejas
Bikes: 34 frames + 82 wheels
The bolts are normally supplied with the BB. You can get a pair cheap >>> https://www.universalcycles.com/shopp...&category=1618
#4
The bolts are normally supplied with the BB. You can get a pair cheap >>> https://www.universalcycles.com/shopp...&category=1618
#6
#7
One other question: I noticed when I place the cranks on the BB, they are not flush against the frame, there is a couple cm's of space. I bought the 110mm BB as recommended by the crank site, so that shouldnt be an issue. My current SRAM s300 fits flush against the GXP BB, so am just wondering if its normal for there to be some space?
#8
i smell bacon
Joined: Mar 2010
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Bikes: Geekhouse Deerfield, GT Edge Ti, Spooky Skeletor, TET Track, Ritchey P-650b, Bridgestone MB-3
That sounds normal to me. Is your chainline straight?
The design for a square taper BB is a lot different than that for a crankset with a GXP BB. If the cranks are not flush against the BB for the S300s, the crank spindle would be able to slide sideways in and out of the BB while you are riding.
The design for a square taper BB is a lot different than that for a crankset with a GXP BB. If the cranks are not flush against the BB for the S300s, the crank spindle would be able to slide sideways in and out of the BB while you are riding.
#9
Veteran Racer


Joined: Jul 2009
Posts: 11,866
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From: Ciudad de Vacas, Tejas
Bikes: 34 frames + 82 wheels
A couple of cm's ? Do you mean mm's ? What exactly do you mean by "flush against BB" ? Some pics would help.
#11
No, probably 1.5 cm's or so. Dont have my camera with me at work, but I can take some when I am home. I mean when I slide the crank arm on the BB spindle, it doesnt slide all the way down, leaving some space between the crank arm and the frame. This is confusing because the first square tapered BB I have used but what yummygooey said makes sense.. As for chainline, my chain hasn't come in yet because the bike is slowly being built, so can't check it yet.
#13
Your cog is slipping.



Joined: May 2009
Posts: 26,053
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From: Beverly MA
Bikes: EAI Bareknuckle
If you're just placing the crank arm on the spindle, you're not seeing it as it will look with the bolts installed as it will slide further onto the spindle when the bolts are tightened.
Even when properly tightened, IRD Defiant crank arms will have a considerable gap when compared to a GXP setup.
Even when properly tightened, IRD Defiant crank arms will have a considerable gap when compared to a GXP setup.
#14
If you're just placing the crank arm on the spindle, you're not seeing it as it will look with the bolts installed as it will slide further onto the spindle when the bolts are tightened.
Even when properly tightened, IRD Defiant crank arms will have a considerable gap when compared to a GXP setup.
Even when properly tightened, IRD Defiant crank arms will have a considerable gap when compared to a GXP setup.
#16
I'm curious as well. They cost me about the same as my s300's, which are a nice stiff ride, but kinda lacking in the aesthetics department. Cant wait to get my new ride up and running.
#17
Chainstay Brake Mafia
Joined: Mar 2011
Posts: 6,007
Likes: 19
From: California
in this case it's crank boltswhenever i teardown and sell a bike for parts, i always keep all the little nuts and bolts, ferrules, any other little odds and ends that would be a pain to have to buy individually
#18
Veteran Racer


Joined: Jul 2009
Posts: 11,866
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From: Ciudad de Vacas, Tejas
Bikes: 34 frames + 82 wheels
The BB should have included the cranks bolts, and if you had bought it from someone else than trashbar they probably would. For the same price you paid, this BB includes the bolts, and it's a very good BB IME >>> https://www.benscycle.net/index.php?m...oducts_id=9452
#19
The BB should have included the cranks bolts, and if you had bought it from someone else than trashbar they probably would. For the same price you paid, this BB includes the bolts, and it's a very good BB IME >>> https://www.benscycle.net/index.php?m...oducts_id=9452
Live and learn I suppose... That bb even has the bolts in the picture
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