TSDZ chain drop fix

[EMGX]

I know I'm not alone with aggravating and gear limiting chain drop with TSDZ2 and probably other DIY mid drives that place the chainring outward resulting in poor chainline. I need large cogs on the cassette for everyday hill climbing and on this Dahon Jack 8 speed the chain drops inboard whenever attempting the inner two. It doesn't adjust outward enough to use as designed but installed upside down and only using the outer surface has prevented drops and only very slightly rubs when on the largest cog.
Just a thought if others are plagued by this shortcomming.

 

[PedalUma]

I know I'm not alone with aggravating and gear limiting chain drop with TSDZ2 and probably other DIY mid drives that place the chainring outward resulting in poor chainline. I need large cogs on the cassette for everyday hill climbing and on this Dahon Jack 8 speed the chain drops inboard whenever attempting the inner two. It doesn't adjust outward enough to use as designed but installed upside down and only using the outer surface has prevented drops and only very slightly rubs when on the largest cog.
Just a thought if others are plagued by this shortcomming.
View attachment 216275

I am with you. The rear end just shifts it off the chainring. It looks like the aluminum 32-t narrow/wide chainring was set at one link off. It is badly worn. The 'wide' teeth are badly sharpened and the 'C' gaps way too large. The chain and gears must also be replaced. I have made those or similar chain guides work but it takes some reconfiguring, such as a little spacer. ToSeven has a small ring that is steel , five bolt at 110 BCD and holds up really well. Small rings just cannot be offset. For most bikes it is fine, but for MTBs with a wide dropout it is a very real problem. Why did you go for a four ringbolt spider? It is not that I want to be a PITA, it is because I am observing and want to be helpful if I can. I have been through this same frustration. When you replace the chainring open the plastic cover behind it and lube the main gear and little step-down gear, this will quiet the motor. Do not over lube just a touch will do.

 

[EMGX]

Pictures can be deceiving. The chain is properly set in the chainring, not a link off. The chainring is like new, it's a wolf tooth product and it's made that way with tooth shape. Chain isn't worn at all and neither is the cassette. The spider is aftermarket made for TSDZ2 and allows smaller chainring than the stock spider (which can accomodate a 34t chainring I have another one with a 30t chainring on another bike also equipped with a TSDZ2. I do have a flat steel 34t chainring that the TSDZ2 seller (years ago) provided along with the stock 42t steel chainring. The aftermarket spiders were very inexpensive. This motor probably could use some lube as it's gotten noisier over the years, thanks for the reminder.

PS
In order to get a lowest gearing possible I used a 12-42 cassette which provides 20 gear inches but of course the stock SRAM X4 can't handle 42t without an extender. Wolf tooth roadlink didn't work with the derailleur hanger but one that I think came for free with a cassette does work well with the B screw removed. I also use a friction shifter which shifts smooth and fast across multiple cogs, same couldn't be said about the stock shifter. I really like the Dahon Jack, it's a great 26" folding bike.