Removing back wheel with horizontal drop outs and hub gears

Hi

Need to take the back wheel off my bike to replace the tyre

The bike is equipped with a 3 speed sturmey archer hub and brake, removing the brake cable is pretty straightforward and I think I should be able to remove the gear chain,

Problem is the bike wheel mounts in horizontal (are these called horizontal drop outs?) so I’m unsure how to remove the wheel as I cant get the chain off, the guy in the shop said that it is quite a tricky thing to do and should be tackled by a bike workshop

Is it a case of sliding the wheel forward to get enough travel on the chain to lift it off the sprocket then sliding it backwards and off the bike?

When refitting is there any tips for getting the correct tension in the chain ?

yep thats it

push the wheel forward and unloop the chain from the bottom of the chainring

i stand next to the bike and with one hand hold the rear of the bike up and the next roll the wheel out enough that you can wobble the chain from the sprocket and put the rear on the ground

worth noting the sturmey archer is quite a weighty hub so dont hold the wheel with your finger tips

make sure everything on the gear cable is tight before unscrewing it although its arbitary when the wheel has to sit an extra half inch further back to get correct tension when before the chain was hanging in the breeze so be ready to readjust the 3speed . which isnt hard

as for tension . pull the wheel so its relatively straight and the chain about tight and tighten the left wheel nut so its snug enough not to move . with your left hand on the chainstay push the rim with your thumb which in turn moves the right hand side of the axle back in the dropout . with your right hand ( you havnt moved your left ) check the tension on the chain . it should be tight enough not to flap but not so tight it binds . tighten the right hand side nut . you will most likely be left with a wheel that tracks slightly to the right ( ie the tyre has more clearance on the left than the right ) just loosen the left nut and center the tyre in the stays and tighten fully . check the right nut is tight . thats called "walking" the wheel . it doesnt take into account concentricity of the chanring or sprocket but i have yet to find a sturmey archer equiped bike that requires that level of fine tension adjustment

Thanks perry thats great