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                 Recent narrower Hornby coach wheels
     
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1st message | this message only posted: 3 Oct 2019 14:09
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from:
Andy Reichert
 

 

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I rarely buy any UK 00 RTR, but was given some latest run Hornby Gresley suburbans recently as a gift. On inspection, I was surprised to find that they have 0.1" wide wheels, particularly since a few years back their 2-6-4 BR tank to experiment with I had bought had 0.11" wide wheels, as per the NMRA HO spec.

Since I will be changing the wheels for P87 width ones, for use on 16.5 mm HO Track, it doesn't affect me, but It certainly won't help UK modellers using commercial 00 track. And, without checking, I thought the DOGA "specs" don't match that size wheel either.

Am I missing something, or is this a big goof on Hornby's part?

Andy



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2nd message | this message only posted: 3 Oct 2019 14:34
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Post your questions on the forum where everyone can see them and add helpful replies.
Andy Reichert wrote: I rarely buy any UK 00 RTR, but was given some latest run Hornby Gresley suburbans recently as a gift. On inspection, I was surprised to find that they have 0.1" wide wheels, particularly since a few years back their 2-6-4 BR tank to experiment with I had bought had 0.11" wide wheels, as per the NMRA HO spec.

Since I will be changing the wheels for P87 width ones, for use on 16.5 mm HO Track, it doesn't affect me, but It certainly won't help UK modellers using commercial 00 track. And, without checking, I thought the DOGA "specs" don't match that size wheel either.

Am I missing something, or is this a big goof on Hornby's part?
Hi Andy,

I can't speak for Hornby, but that matches the traditional UK BRMSB "Scale 00" wheels at 2.5mm wide, and also the Romford/Markits kit wheels:

 http://www.markits.com/about.html

In the olden days the Peco catalogue called them "Type A" scale 00 wheels.

Assuming the Hornby wheels have the corresponding 0.7mm effective flange thickness, for 00 those wheels should be set to the likewise traditional 14.5mm 00 back-to-back (instead of 14.4mm for NMRA RP25/110 with 0.8mm flanges).

As such they will run just fine on 00-SF (4-SF) track (16.2mm gauge, 1.0mm crossing flangeway).

A great many 00 track-builders have now gone over to the 00-SF standard.

To run on 00-BF or DOGA-Intermediate pointwork, it will be necessary to use sharp-nose vees to avoid or limit any wheel-drop in the crossings.

How they will run on commercial pointwork such as Peco I can't say.

(For use on EM the also traditional 16.5mm EM back-to-back, instead of 16.4mm for NMRA RP25/110 RTR wheels on EM.)

cheers,

Martin.

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3rd message | this message only posted: 3 Oct 2019 19:24
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from:
Rob Manchester
Manchester



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Hi Andy,

I too have some Hornby Gresley Suburban coaches of the latest generation and the wheels are indeed 2.5mm wide ( 0.1" ). The back-to-backs are between 14.2 and 14.3mm as supplied. I also have a few Hornby BR( ex LMS ) surburban coaches purchased recently and they are the same in wheel width and BtB settings. All other RTR coaches of recent vintage from Bachmann/Hornby etc seem to have 2.8mm wide wheels.

The wheels can of course be pulled out on the axles with a NWSL puller or similar if required.

Rob


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4th message | this message only posted: 3 Oct 2019 20:34
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from:
Andy Reichert
 

 

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Rob Manchester wrote: Hi Andy,

I too have some Hornby Gresley Suburban coaches of the latest generation and the wheels are indeed 2.5mm wide ( 0.1" ). The back-to-backs are between 14.2 and 14.3mm as supplied. I also have a few Hornby BR( ex LMS ) surburban coaches purchased recently and they are the same in wheel width and BtB settings. All other RTR coaches of recent vintage from Bachmann/Hornby etc seem to have 2.8mm wide wheels.

The wheels can of course be pulled out on the axles with a NWSL puller or similar if required.

Rob
Oh Dear,

That sounds as though the BB is too tight to run through NMRA HO Turnouts. Also the later boxes say "00 Scale" whereas the loco box says "00 Gauge". Sticking with the NMRA US HO standard would have made life so much easier.

Getting the wheels out of the bogies non-destructively is a prerequisite to safely altering the BB. That looks to be extremely difficult without special tools, I'm expecting to have to cut through the axles and fit my own inside frame bogie chassis to hold the replacement wheels.

Andy

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5th message | this message only posted: 3 Oct 2019 23:28
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from:
Rob Manchester
Manchester



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Hi Andy,

No it isn't easy getting the wheels out on the Gresley coaches. You can risk spreading the bogie frames but be ready for the sound of cracking plastic :( The BR(ex LMS ) ones are very simple.

Rob


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