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If you want to use a 120mm hub within 130mm spacing there are a couple of options. With steel frames, if you’re brave you can tighten the nuts on the axel bringing the dropouts inbound 5mm either side. Some people are happy to manipulate their frames like this and others are less so..! The other option is to use spacers. In any case this may lead to issues with chainline.
There are a couple of threads on the forum relating to 120/130mm spacing if you have a rummage eg:
https://www.lfgss.com/conversations/160658/#comment7005502
In the case of halo aerotracks there is a specific spacer kit available…
hi pizzarat, thanks for your reply
I'm looking to cut some weight so probably the same wouldn't help?
What difference does the spacing make? #wheelignorance