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I own a Serious Rockville Hardtail MTB 27.5' bike from 2019. Recently the quick release from the rear wheel got stolen.

As the axle is still in place, I was thinking to buy a quick release online and trying fixing myself. But when browsing online I could see different types of QRs in the market, in terms of length which actually make sense.

I was wondering whether we could find out which skewer to buy based on the bike specifications.

These are the specifications I could find from the manufactures website.

Component Details
Rims Meghna Disc Specific 512-035 aluminum double wall 27.5 inches
Front tire Meghna MR-2620 2.1 inches
Rear tire Meghna MR-2620 2.1 inches
Hub (front) KT KT-MD7F
Hub (rear) KT KT-TD4R
Tire size (inch) 27.5 ″
Impeller size 27.5 ″

Updated: You can find the bike model here They dont sell the same bikes anymore. I think they updated the model in 2020, here is the new one. But I assume the measurements might be the same, especially for the QRs.

DavidW
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Anu Bhuvanendran Nair
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1 Answers1

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I couldn’t find the manufacturer website, so I couldn’t confirm if the bike had quick releases or thru axles. I know you said quick release, but thru axles are very common on disc brake bikes these days.

If you do have a QR, you would need to look for a 135mm rear QR. That’s the standard length for MTB rear hubs. Road bikes used 130mm, but you could use an MTB QR on a road bike. If a manufacturer doesn’t list a length for the rear QR, you can often assume it’s 135mm. To my knowledge, Salsa Cycles, a common aftermarket QR, does this, and this seems to be the general practice on online retailers. I updated the terminology index page on QRs to include this information. You could avoid getting any QRs that are associated with a road-only brand, e.g. Shimano Ultegra or Dura Ace QRs.

The terminology index entry for thru axles has a photo of a thru axle with a quick release beside it. If you have a thru axle, replacement will be more annoying because there are many different lengths. The entry has a guide to replacing those.

Weiwen Ng
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  • Thank you very much @Weiwen. I updated the question with the link to the bike model. From the index entry, I think mine is not thru-axle. – Anu Bhuvanendran Nair Dec 09 '21 at 12:13
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    @AnuBhuvanendranNair I don’t read German, but I think I see quick release nuts on the drive side of the bike. Thru axles would be flush with the dropout. – Weiwen Ng Dec 09 '21 at 15:24
  • A hub with 135mm over-locknut distance evidently needs longer than a 135mm skewer. – MaplePanda Dec 09 '21 at 16:03
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    @MaplePanda true. For simplicity, I omitted that part. The fact is almost all retailers will list skewers as 135mm, if they list a length. Interestingly enough, Trek seems to list its skewers in actual length. https://www.trekbikes.com/us/en_US/equipment/cycling-components/bike-wheels/bike-skewers/bontrager-elite-internal-cam-skewer/p/14309/?colorCode=black – Weiwen Ng Dec 09 '21 at 16:33
  • I reckon QR from the pic of the 2020 model as well. I'd be surprised if a >135mm rear hub was QR, so 135mm should be good. I read just enough German to reckon the specs don't give that much detail even if I look at "Nabe (hinten)" (rear hub) on the 2020 model and search the part number, it seems to be a discontinued OEM part, and the new model has both QR and TA versions. – Chris H Dec 09 '21 at 21:52
  • Note (@MaplePanda) that the nominal dimension of a mechanical part may not be any physical dimension on the part but a mating dimension or a reference dimension. This is particularly true on threads for pipes, but even common metric screws are always narrower than the nominal size (the thread is specified to be flat-topped; if it wasn't, the diameter would match the nominal size) – Chris H Dec 09 '21 at 21:52
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    @ChrisH Salsa lists fat bike QR skewers on their website, and they were really wide. That’s the exception, though. – Weiwen Ng Dec 09 '21 at 22:40
  • @WeiwenNg It’s been a while since I last bought a QR skewer, but I remember they were sold according to external dropout spacing. Aluminum frames with thicker dropouts would need longer QRs than thin steel dropouts. I suppose it varies greatly. – MaplePanda Dec 10 '21 at 02:36
  • @ChrisH See my comment to Weiwen. Side note: there’s the 141mm “QR Boost” standard used by some budget hardtails, and there might be fat bike stuff too. – MaplePanda Dec 10 '21 at 02:37
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    @MaplePanda With QR on my steel and aluminium bikes I can see that. However they seem to be titled by nominal size ("front"/"rear"/"boost") rather than actual length, with the actual length in the specs if you're lucky. This all reminds me - I need a new skewer for my hardtail: external cam+ disc brakes mean I need to check frequently or risk losing the wheel landing even my little jumps – Chris H Dec 10 '21 at 09:56
  • @ChrisH Looks to vary heavily by brand I guess. The Shimano ones I'm familiar with have packaging like the following with many length options: https://www.ebay.com/p/14006749252 – MaplePanda Dec 10 '21 at 22:55
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    Interestingly @MaplePanda while there are tickboxes for the true length, they haven't actually been ticked – Chris H Dec 12 '21 at 09:47