› Forums › General Discussion › Roll-off observatory runners/wheels. › Rool off roof
29 July 2018 at 3:07 am
#579768
![](https://britastro.org/wp-content/uploads/2018/04/picture-577-1524623094-80x80.jpg)
Participant
Hi Dennis,
just following up on your recommendation on wheels and track.
I’ve looked at the site the wheels come in three sizes and at the price you quote I would think these are the 50mm diameter V wheels. The other diameters being 60mm and 78 mm se
My Observatory is 3.6 x 4.2 m. with a Pent roof which is felted. Based on your experience which sized wheel would you recommend.
The track you mentioned has a round rather than inverted V guide. Does this except the V groove wheels.
Many thanks,
Eric