Author Topic: MK2 Nomad Seat post Diameter  (Read 386 times)

spoof

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MK2 Nomad Seat post Diameter
« on: April 24, 2020, 02:00:01 PM »
Just wondering if anyone has done away with the 27.2mm shim reducer in their MK2 Nomad seat tube when fitting a new seat post? If so, what diameter seat post would be needed? My digital calipers give an internal diameter of approx 29.95mm but they could be out for all I know. I don't have any calibration objects to hand unfortunately.
Any advice much appreciated. Reason I ask is just for price / availability. Happy to run with or without shim.
Thanks K

PH

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Re: MK2 Nomad Seat post Diameter
« Reply #1 on: April 24, 2020, 06:48:01 PM »
I don't understand why anyone would. 
27.2 is probably the most common size available, my favorite seatposts are only made in that size. 
Plus (Though I have no knowledge if this is the case with Thorn) if a shim was intended the reaming of the seat tube, post production, wouldn't need to be as precise as the shim will absorb slight irregularities.  Double plus, the advantage of a shim is that it'll probably eliminate any chance of a seatpost becoming seized in the frame - that's something which shouldn't happen if re-greasing the post is a part of your regular servicing and the shim should not stop you continuing to do this, as it has other benefits.

spoof

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Re: MK2 Nomad Seatpost Diameter
« Reply #2 on: April 24, 2020, 08:35:54 PM »
The benefits of the shim do put it in favour to use so thanks PH, I'll stick with it and buy the suitable 27.2mm post I have found in correct length. If the grease between seat tube inner and the outside of the shim is sufficient to prevent water ingress and hence steel rust and galvanic corrosion, is the general rule to also apply grease the seatpost itself in addition?

PH

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Re: MK2 Nomad Seat post Diameter
« Reply #3 on: April 24, 2020, 09:05:55 PM »
I grease both sides, it probably doesn't need it and I don't know what the official advice is.  I can't see it does any harm and I already have the seatpost out and the grease open.