I think Thruxton shocks are 1" lower than stock Bonnies. You will have to lower the fork tubes to match whatever decrease you are looking to get. If you go that route, get some performance Ikon shocks from newbonneville. You can get them set up for 1" lower. Also, upgrade the fork springs.
i just put the bonnie Ikon shocks on my Thruxton last night and it dropped the rear around an inch. I've only ridden it for around 20 minutes, but so far lowering the front and rear has made a huge improvement.
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