i picked up a 17 inch wheel style 157 i think for £20 on gumtree with a 5-6mm mm rf tyre,i only use it on long trips,,more than 20 miles,,i have it wrapped up in bubble wrap and just throw it in when needed,,i also have an electric pump for emergencies,,also have an old foot pump which i use to put a few lbs in tyres when they need doing,i researched the wheel size and it fits my 335d etc with bigger calipers...
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