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try halfords to 70 psi

http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_221181_langId_-1_categoryId_165648#dtab

Number One Contributor

A: 

The Halfords Tyre Inflator will happily inflate to over 70PSI, however when tyres are already inflated above 50 psi we recommend removing some of the air from the tyre to say 40psi to allow the pump to inflate the tyre gradually. If you try to inflate tyre which are already in excess of 50 psi this may cause the pump to stall

5 months, 1 week ago

by

HalfordsWebTeam

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 have 2 of the Halfords 12 v cigar lighter jobs. One in the car. I use both, and have not had problems. The gauges are fairly accurate, but I use my digital one for final pressure check. 

good point, NEVER trust the gauge on a tyre pump,most are wrong.

http://www.theultimatefinish.co.uk/Store/Product/ProductDetails.aspx?ProductId=296

interesting thread
so what is the general inflation pressure on a caravan
lets say a 4 berth ?

there is not one general pressure,mine is 37 psi.some caravans with the same size tyre are 42 psi,some are 40 psi.it depends on weight of the MPTLM of the van,or max gross and the size of tyre.also depends on type of tyre,

http://www.tyreline.com/trailer_caravan_wheels_tyres/hs_trailer_tyres.aspx?Page=2

not normally watched,there was a pump on a shopping channel yesterday afternoon.think it was QVC,cost £20 plus post.this went to 120 psi.looked a good buy.did anyone else see it?