The recommended pressure to inflate a tyre to is usually embossed on the tyre's sidewall, often as minimum and maximum figures rather than an exact target. There are a number of factors to consider when deciding how hard your tyres need to be fixed.
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wheel spokes go into a hole in the hub flange and held there by a head. Spokes usually have a 90 degree bend at the head-end but some hubs are designed for straight spokes. If you are replacing a spoke it needs to match the others in shape and length.