"reason is to get rear wheels in further "
The reason you cannot get the wheel in any further is usually because you meet the end stops on the hubs.
Many hups have an insert that you can tap out allowing you to position the axle through the hub.
There are dangers to doing this, Usually if a wheel moves, it moves inward. Without the endstop there is nothing to stop the wheel moving in to the point where the tyre touches the chassis.
This used to be quite a common occurrence, and there is nothing like bolt head cutting through your sidewall to ruin your day. The answer is to slide a shot bit of plastic tube over the axle so that the wheel cannot slide in to the point where tyre contact occurs.
There are two more problems. If you use deepset hubs and go right in, the axle can protude outside the tyre. Thats illegal obviously.
You can also 'run out of key' but again usually the key repositions in far enough.
As for next year, you would have to have a set of modified sidepod tubes, so that you can keep the tyres with the 40 mm limit....and probably a special bumper so that that doesn't protude either.
You will also find the axle makes the hubnuts difficult to access. Indeed that's one of the reason we had mononuts
Oh, and lastly, you need to measure your wheelbase. Your track must be a minimum 2/3 of the wheelbase (that's between 101 cm and 127 cm). It's unlikely you can set a track of less than 840mm.
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