Boom Racing Rock Monster Silicone Tire Inserts – 1.55″/1.9″ | CompetitionX

A pair months in the past we talked about Growth Racing’s silicone tire inserts and why we thought they have been a superb thought (see that right here: Growth Racing Rock Monster Purple Silicone Tire Inserts. Properly, BR is at it once more with 2 extra inserts for 1.55″ and 1.9″ purposes! Each of those new inserts are color-coded for …

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