AWD said:
tomtom50 said:
Hi, In my case the gear reduction did not hit the chainstay. The unit seated against the bottom bracket just as the reduction almost touched the chainstay, less than 1mm clearance. I suspect many aluminum frames there would be interference because the tube diameter is larger. I imagine you needed to shim at the bottom bracket, increasing the chainline still further?
In that case an option seems to be to shim the 42T chainring in with 10mm inside diameter washers, but it looks to me like you could gain only 1mm or so.
And then somehow you would need a chainring dished more than 5mm? I'm not following how you bring chainring back in if you have to shim at the bottom bracket.
It looks to me like I was lucky with my fit, that Tongshin designed tightly to a steel frame with 68mm bottom bracket, that the gear reduction is wide enough so chainline is OK only with a steel frame and 68mm bottom bracket?
No I did not need a shim. I used a BBSHD 42t narrow wide tooth 10mm offset chain ring that was at hand. I took the TS spyder and cut off the 110 tabs, drilled it out for the new rings holes using the ring as a template to mark it. I had to source a spacer and rather than using a bunch of washers I found some the perfect length and diameter at the hardware store but they were white nylon. I didn't hold much hope for them but they are still there and holding strong, Object was to get the chainring as close to the chain stay as possible. The only problem I had was that it rubbed in one spot on the plastic guard cover and wore down one of the stock bolt heads that secure it. The plastic stuck out so I hit it with the heat gun and got it to lay flatter and replaced the bolt with a button head.
However here is a 10mm offset chainring that will bolt right to the stock adapter it's not cheap but neither was my time figuring out how to do my hill billy version and that ring alone was $80 retail. http://www.electrifybike.com/store/p65/42_Tooth_Narrow%2FWide_CNC_7075_T6_Chainring_%2810mm_offset%29_for_TSDZ2.html
The chainline is the biggest issue in the TSDZ2 motor manly for a MTB usage.
To have a better chainline in fact the 42T chainring, with a 10mm offset, is the only solution for most of the cases, if you use a MTB cassette.
But to have a good, MTB, ratio you need to have a cassette with a high cog, maybe 50.
I´m using a sunrace 11-50, 11 speed cassette. I use it with one cog less.
I´m using only 10 cogs.Is a custom made cassette. With the 12 speed SRAM GX derailleur and a 12 speed chain. The shifter is a 11 speed SRAM GX.
I use the derailleur screws to restrict the movement of the derailleur after the 50 cog.
It works ok.
But if I started now I think I would go for Shimano 11 speed Alfine.
Maybe you solve almost all the problem with chainline, you also have a good ratio (409%), (in 11-50 cassette you have 455% ratio), maybe is less expensive, and you have a shifter with gear indication.
And also, you maybe can use a 34 chainring or the stock 42T with 5mm offset.
The weight is maybe 600g more, but you have a cleaner solution and more reliable.
Think about Shimano alfine.