THM M3 spindle issue
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- eliflap-scalpel
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Tried to install my M3 on a BMC URS bike with 4130 press fit bb.
The spindle is nor able to fit the bearings
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The spindle is nor able to fit the bearings
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- eliflap-scalpel
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Crank is a beautiful piece of art
The 40T CarbonTi ring matches it perfectly
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The 40T CarbonTi ring matches it perfectly
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- eliflap-scalpel
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But 2 pairs of bearings do not fit the spindle
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- eliflap-scalpel
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Wrote to THM yesterday.
Any suggestions?
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Any suggestions?
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Try using some grease to help, it’s a tight fit but I’ve never had any issues using any 30mm bearings.eliflap-scalpel wrote:Wrote to THM yesterday.
Any suggestions?
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- ultimobici
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I presume the crank is new. Is the BB new too?eliflap-scalpel wrote: ↑Sat Mar 11, 2023 10:29 amWrote to THM yesterday.
Any suggestions?
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Have you measured the axle to see what the difference is?
- eliflap-scalpel
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i tried Wheels Manifacturing, SRAM and Rotor bearings with no luck ...
will try with grease, rubber hammer and book to save carbon arm
will try with grease, rubber hammer and book to save carbon arm
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Have THM not replied? I'd wait just in case they have a better solution. Perhaps the axle is out of spec?eliflap-scalpel wrote: ↑Tue Mar 14, 2023 2:00 pmi tried Wheels Manifacturing, SRAM and Rotor bearings with no luck ...
will try with grease, rubber hammer and book to save carbon arm
I have found this to be a common issue with BB30/PF30 cranks and bearings and while freezing the spindle may allow insertion, if there is any binding such that you need to bang on the crank with a rubber mallet to get it inserted, that is most certainly going to seriously distort the inner races of the BB bearings. I have always felt that either the BB30/PF30/BB386 standard is not clear as more often than not the spindle ends up being oversized by .2 - .3 mm. My solution when installing an SRM Hollogram powermeter with a Cannondale BB30 spindle was to use very fine grit Emory cloth and 'wet polish' the spindle enough that a few microns of material are removed to the point that the spindle could be inserted by hand with only a moderate amount of effort.
- Michael
"People should stop expecting normal from me... seriously, we all know it's never going to happen"
"People should stop expecting normal from me... seriously, we all know it's never going to happen"
- eliflap-scalpel
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Solved
Done 30 minutes with 800 sand paper on the spindle and a small amount of vaseline, it will fit.
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Done 30 minutes with 800 sand paper on the spindle and a small amount of vaseline, it will fit.
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Good to know. I'm waiting for my THM crankset to arrive.
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