I've only read much about dbol and anavar as effective bridges. You gotta keep the dose ultra low to not suppress LH/FSH though.
In order to successfully bridge between cycles (and this means using a low dose of AAS, in this case dbol), you need to recover your natural hormonal levels to pre-cycle levels or to within acceptable parameters, and then you start your next cycle. The idea here is that you won´t lose any gains, but rather a low dose of an AAS will help you maintain them. Typically, you´d use around 10mgs/day of dbol and combine it with an aggressive Post-Cycle Therapy (PCT) course of Nolvadex (and/or Clomid) and HCG. This would give you full androgen replacement from the Dbol and a shot at recovering your natural hormonal levels via the other stuff you are taking. Remember, the 100mg/day dose of dbol in the study we looked at earlier did not suppress Test, LH, or FSH to a degree that would make recovery impossible and certainly not with 1/10th that dose in conjunction with an aggressive PCT.
That being said, I don't see the point of bridging any more with the existence of good PCT, SARMS, IGF and HGH. If anything, cruise unless you're still young.