TSDZ2 hardtail MTB conversion picking the right budget bike

hartswood

Just Joined
Sep 11, 2019
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I'm going to install a 48v 500w TSDZ2 on a new yet to be purchased hardtail MTB. This will be my first conversion.I have a bike wishlist air forks, decent Shimano brakes and rear derailleur. In order to give the motor more ground clearance I thought I'd go for a 29er. I've been trawling through the end of season bike sales for a suitable purchase. Reading this forum has given me an idea of what I should look for, but I have somes questions:

1. On a bike fitted with a SLX / XT 1X11 groupset If the chainstay rubs against the motor and I have to add spacers,widening the chainline, is it likely I'll be unable to use the full cassette range? Generally is it better / easier to go for a three chainring bike? I have a bike in mind and have found a picture on the web showing its stock chainstay / cassette setup, the clearance looks limited. I don't have the bike's measurements.

2. Another possible purchase has a thick bottom bracket cable guide, picture attached. Will I have to remove this to fit the motor? Would it be easier to pick a bike with in-frame routed cables? Should I look for a smooth bottom bracket base to avoid grinding the frame?

3. My budget is limited to £500 for the bike purchase, ideally lower. My wish list limits choice. Air forks in my price range are difficult to find. Ideally I'd like something around 13kg, but the only sub £500 bike is 15kg. With the TSDZ2 can I basically disregard weight?

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peter.c

Esteemed Pedelecer
Apr 24, 2018
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219
thurrock essex
I suspect you might have a problem with the motor and the chain stay distance
The motor could be spaced out up to 73mm but that makes for bigger problems with the chain line
I have converted a voodoo 1x11 that started with a single 32 on the front and a kona with a 1x10 with a 34 both with TSDZ2 but they both with minor clearance problems
But a bike with triple front will have more space
The gear cable is an easy fix, just remove the the braket and replace the cable outer
Remember the fixing for rear anti turn bracket on the back of the motor
IMG_20190521_171629593.jpg
 

Nealh

Esteemed Pedelecer
Aug 7, 2014
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West Sx RH

hartswood

Just Joined
Sep 11, 2019
2
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I suspect you might have a problem with the motor and the chain stay distance
The motor could be spaced out up to 73mm but that makes for bigger problems with the chain line
I have converted a voodoo 1x11 that started with a single 32 on the front and a kona with a 1x10 with a 34 both with TSDZ2 but they both with minor clearance problems
But a bike with triple front will have more space
The gear cable is an easy fix, just remove the the braket and replace the cable outer
Remember the fixing for rear anti turn bracket on the back of the motor
View attachment 32089
That's really handy advice, thank you. I've decided to buy the motor before the bike so I can get a better feel for stuff like the anti turn bracket. The clearance looks tight between the bottom bracket and motor. I may fit it to an existing cheap MTB I own just to get the hang of what's involved and how it feels, before mucking about with something good and new. I think I'll also order a Yosi Power 48V battery 11.6Ah Samsung .
 

76zedfour

Just Joined
Oct 16, 2019
3
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@hartswood , is that a voodoo bizango in your photo?

I am considering putting a tsdz2 on that bike so wondered how you got on? @peter.c I was looking at your pics but as I am a bit of a biking numpty I don't really understand the problem regarding the chainstay. Is it that the increased diameter of the new 42T chain ring now hits the mainstay where it bulges out almost straight away from the crank ?
 
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vfr400

Esteemed Pedelecer
Jun 12, 2011
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Basildon
@hartswood , is that a voodoo bizango in your photo?

I am considering putting a tsdz2 on that bike so wondered how you got on? @peter.c I was looking at your pics but as I am a bit of a biking numpty I don't really understand the problem regarding the chainstay. Is it that the increased diameter of the new 42T chain ring now hits the mainstay where it bulges out almost straight away from the crank ?
Yes. Modern MTBs tend to have wider tyres, so the chainstays are spaced further apart. They also have low gearing, so they use small chainwheels that can keep clear of the chainstays. If you want to use the bike for proper off-road stuff, you have to choose carefully. If you want to ride the bike mainly on the road, you'd be much better off with an older MTB or a hybrid type bike that has narrower tyres. Remember, when you have electrical assistance, you don't need all those fancy gears and things unless you're doing serious off-road biking.

If you have one of those chain-guides under the BB, you can remove it and run the cables in an outer cable. That way, you can route the cables wherever you want. If necessary, you can use the outer all the way from the shifter to the derailleur, or you can just use a short outer between the end-stops either side of the motor.
 

76zedfour

Just Joined
Oct 16, 2019
3
0
I have a carbon hybrid and find it a bit jarring on the tracks, dry bridleways and kerb hopping that i do and as that can't be fitted with a mid mount kit I guessed a MTB might be better. I live on an island and used donor bikes are pretty hard to come by and this voodoo is a cracking price. I do like the look of it though with the 29 wheels as I am quiet tall. So if I did go for this are you saying I would have to put some spacer rings on the chain ring side of the crank to move it out slightly so that it doesnt snag on the chainstay? Does this then cause a problem with the chain alignment with the cassette so the very top gears might not be usable?
 
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peter.c

Esteemed Pedelecer
Apr 24, 2018
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thurrock essex
Try and find a bike with a triple front chain wheels, most voodoos will convert with the 73mm bottom bracket, the newer 11/12 speeds with the 32 front chain wheel are a concern
spacers can cause more problems than they solve