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Trek Slash+ bash plate replacement — what are the options?
- Thread starter Bloke900
- Start date
Good news on the Slash+: the bashguard is genuinely a service item, which is unusual for an eMTB. On most high-pivot e-bikes you're looking at a non-replaceable lump moulded into the chassis — Trek actually let you swap it.
What you're dealing with
The Slash+ bashguard houses the lower idler pulley, which is an MRP MXG unit — third-party compatible, so you're not locked into Trek-only parts for the pulley itself. @whitymon flagged this one → view post, which is handy if the pulley's worn rather than the guard cracked.
If it's the guard itself that's gone — @Emailsucks98 cracked one after bike park laps → view post — that's a known failure point, so you're not alone there.
Fitting it — the bits that bite
A few hard-won tips from owners on here worth heeding:
• Use a quality T55 torx bit. The motor/mounting bolts are soft and round off if you look at them funny — @Emailsucks98 learned this the awkward way → view post.
• Loctite the threads, anti-seize the shafts. When @Emailsucks98 chased a TQ motor creak, the fix was cleaning everything, Loctite on the bashguard/mounting plate threads, and anti-seize on the bolt shafts — silent since → view post. Worth doing on reassembly even if you've no creak yet, because that area is the usual culprit.
• Rotate the lower pulley up as far as it'll go. Trek's own guidance is to set it as high as possible for maximum ground clearance and chain wrap → view post — easy to forget on reassembly and it changes how often you smack the thing.
Getting the part
For the genuine guard and any mounting hardware, your Trek dealer can pull it by part number — and the MY25 service manual @whitymon dug up walks through the assembly torques and sequence:
retailerassetsprd.blob.core.windows.net/techassets/SlashPlus_ServiceManual_MY25_2025-07-07.pdf
If you can tell me whether it's the guard cracked or the pulley worn, I can point you at the right replacement — they're separate parts. A photo of the markings would settle it too.
What you're dealing with
The Slash+ bashguard houses the lower idler pulley, which is an MRP MXG unit — third-party compatible, so you're not locked into Trek-only parts for the pulley itself. @whitymon flagged this one → view post, which is handy if the pulley's worn rather than the guard cracked.
If it's the guard itself that's gone — @Emailsucks98 cracked one after bike park laps → view post — that's a known failure point, so you're not alone there.
Fitting it — the bits that bite
A few hard-won tips from owners on here worth heeding:
• Use a quality T55 torx bit. The motor/mounting bolts are soft and round off if you look at them funny — @Emailsucks98 learned this the awkward way → view post.
• Loctite the threads, anti-seize the shafts. When @Emailsucks98 chased a TQ motor creak, the fix was cleaning everything, Loctite on the bashguard/mounting plate threads, and anti-seize on the bolt shafts — silent since → view post. Worth doing on reassembly even if you've no creak yet, because that area is the usual culprit.
• Rotate the lower pulley up as far as it'll go. Trek's own guidance is to set it as high as possible for maximum ground clearance and chain wrap → view post — easy to forget on reassembly and it changes how often you smack the thing.
Getting the part
For the genuine guard and any mounting hardware, your Trek dealer can pull it by part number — and the MY25 service manual @whitymon dug up walks through the assembly torques and sequence:
retailerassetsprd.blob.core.windows.net/techassets/SlashPlus_ServiceManual_MY25_2025-07-07.pdf
If you can tell me whether it's the guard cracked or the pulley worn, I can point you at the right replacement — they're separate parts. A photo of the markings would settle it too.
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