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Author Topic: Quick release vs. thru bolt  (Read 1254 times)

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Offline Rockhopper

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Quick release vs. thru bolt
« on: August 07, 2013, 07:35:56 PM »
Hey - This might be a really stupid question. I got a new front wheel for my stumpjumper. The old wheel had what I think is called a 9mm thru bolt (with a quick release on one end.) It's much thicker than what I would call a regular quick release axle (which I think is 5mm) that pretty much every mtb used for years. Here's the question: Is the Rockshox Recon Dual Air fork specific to a certain axle size? In other words, can I mount the fork on the 5 mm skewer or is that dangerous and/or ill advised? (I mounted the QR onto the fork and it seems to work riding around my driveway, but that's obviously not the same as trail riding.) Just to be clear, I'm not asking about the hub. I'm wondering about the fork. Thanks
« Last Edit: August 07, 2013, 07:47:40 PM by Rockhopper »

Offline Dcluley

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Re: Quick release vs. thru bolt
« Reply #1 on: August 07, 2013, 08:01:48 PM »
What kind of hub is it?  You just need to buy the aftermarket part kit to convert the new hub to the old Thru-axles you used.

Stans has a bunch for hope, DT Swiss, and their own hubs.  http://www.notubes.com/Hub-Parts-DT-Swiss-Hope-C81.aspx

I am sure the hub manufacturer's website would have something similar.
« Last Edit: August 07, 2013, 08:06:25 PM by dcluley »
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Offline Rockhopper

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Re: Quick release vs. thru bolt
« Reply #2 on: August 07, 2013, 08:10:51 PM »
It's a stans hub. I guess what I'm asking is, is it necessary to convert the hub? I don't have any particular affectiion to the larger axle, so if it's safe to run the thinner axle on the same fork, I'm fine with that. But I think you are telling me that it's not safe? (And thanks for the response. Much appreciated.)

Offline $irWattZZZZ

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Re: Quick release vs. thru bolt
« Reply #3 on: August 07, 2013, 08:54:20 PM »
if I am following you, a standard qr skewer is 5mm but the portion of the hub that actually sits in your fork drop out is 9mm. If your recon is a standard qr drop out you should have no issue with your new stans hub and a standard qr.

Offline mmountainbiker

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Re: Quick release vs. thru bolt
« Reply #4 on: August 07, 2013, 08:56:07 PM »
Thru axles are 15 mm right?

Offline $irWattZZZZ

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Re: Quick release vs. thru bolt
« Reply #5 on: August 07, 2013, 08:59:54 PM »
no dt makes a 9mm and apparently so does the big s as seen in the first few posts of this thread.
http://forums.mtbr.com/29er-bikes/9mm-thru-axle-qr-489414.html

Offline Rockhopper

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Re: Quick release vs. thru bolt
« Reply #6 on: August 07, 2013, 09:17:04 PM »
Yes, the fork has what Rockshox refers to as "standard dropouts." That would lead me to beleive that the fork will accept the 5mm QR AND the 9mm QR. (It would not, for instance, accept the 20 mm.)  But I wanted to make sure before I did something stupid.

Offline Rockhopper

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Re: Quick release vs. thru bolt
« Reply #7 on: August 07, 2013, 09:20:58 PM »
If it helps, this link shows a picture of the 5mm versus the 9mm. The link, however, does not say whether a standard fork will accept both of those skewers. That's what I'm wondering -- will a regular fork like a Recon handle either one interchangebly.


http://www.amclassic.com/download/manuals/9mm_thruaxle_qr_vs_standard_qr.pdf

Offline $irWattZZZZ

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Re: Quick release vs. thru bolt
« Reply #8 on: August 07, 2013, 09:42:34 PM »
yes, look at the pics in the link I posted. your previous skewer was 9mm in diameter and actually sat in the fork dropouts, your new 5mm skewer goes thru the end caps on your hub which have an outer diameter of 9mm like your prior 9mm big s skaxle. So now rather than your skaxle sitting in the fork dropouts your hub end caps do.

Offline Dcluley

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Re: Quick release vs. thru bolt
« Reply #9 on: August 07, 2013, 09:48:27 PM »
Like scott said, the fork actually "rides" on your hubs.  The dropouts should match, if it is the skewer that came with the wheel, should be fine.
« Last Edit: August 07, 2013, 09:54:38 PM by dcluley »
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Offline Rockhopper

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Re: Quick release vs. thru bolt
« Reply #10 on: August 07, 2013, 09:49:17 PM »
Awesome. Thanks Scott (and everyone else.) I figured it was simple, but I didn't want to do it and then find out I was wrong when the axle snaps going 25 mph down some big drop.

Offline mmountainbiker

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Re: Quick release vs. thru bolt
« Reply #11 on: August 07, 2013, 09:59:24 PM »
Maybe I missed it but whats the advantage of a 9mm thru-axle?


Offline bjdraw

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Re: Quick release vs. thru bolt
« Reply #12 on: August 08, 2013, 07:44:47 AM »
Thicker thru-axles flex less. This is less important on a something like a road bike, and more important for long travel bikes. This is why there are so many to choose from. The standard quick release is fine for most applications and at the same time the 20mm thru-axel of big downhill bikes is an overkill. Trail or all-mountian bikes in the middle are becoming more common with 15mm thru-axels, but plenty still come with the old trusty standard.

 

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