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I just got my trek marlin 7 bike and was wondering if I can convert it to TA( through axle).

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  • If its not too late, can you return the bike as-new to the bike shop and choose the bike you wanted anyway ?
    – Criggie
    Apr 1 at 2:22
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    In general you can't do this (at least not very well) because the slots where the axles go must be larger for a thru-axle bike. Apr 1 at 12:42

2 Answers 2

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No, your frame is made for a quick release (QR). It cannot be converted to thru axle. That would require a new frame.

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TLDR: rear, no, front, maybe. But the gain would be marginal, and is not worth the complication.

For the rear wheel, no, as the attachment system is part of the frame. But even if you could change it, the spacing for the wheel would still be 135mm (or 142mm TA axle length), while TA MTBs are using the Boost standard and have a 141mm spacing (so a 148mm axle length). To my knowledge, the offer in off-road wheels with 142mm axles are mostly gravel bike wheels. 142mm MTB seems to be a niche compared to 148mm or gravel.

For the front wheel, it's a bit different. You could technically change the fork and choose a fork with a through axle ...but: you need to check what kind of head tube the bike has: 1"1/8 (found on entry-level MTBs) or conical. I haven't seen forks with 1"1/8 head tubes and TA. Trek doesn't say which standard is used on the Marlin (which usually implies it's the one considered the "lowest"), so the answer is "probably not".

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  • There’s plenty of MTB 142TA hubs/wheels still being sold, which are labeled as “non-boost”.
    – MaplePanda
    Apr 1 at 7:46
  • @MaplePanda I checked and corrected, but I wouldn't say "plenty": looking at bikester (popular EU online shop), there are 8 references for rear wheels with 142mm axles, and 137 for 148mm. And some of these 8 references are in fact modular hub that be adapted in 135mm QR or 142mm TA.
    – Renaud
    Apr 1 at 7:53

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