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sgsmith

Tt02 high speed adapter compatible spur

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I'm at a loss.  I've been trying trial and error with ordering 64p and 48p spurs that look like they are compatible with the tt02 high speed gear adapter.  Can anyone recommend a compatible spur in the US? I've heard 3racing and rw racing make compatible ones,  but can't seem to find which model exactly. Trial and error ordering from the uk to texas just sounds too expensive.  So please,  if anyone has experience with running 64p or 48p gears in a tt02, please help me understand what I need to be doing.  Not sure if there just another drive line setup that might work better,  or if there's known brand and models that are compatible with the adapter.  

 

Thanks in advance.  I'm just trying to do speedrunning with a tt02 and I'm kind of at a point that I really need to start gearing up significantly.

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12 hours ago, sgsmith said:

I'm at a loss.  I've been trying trial and error with ordering 64p and 48p spurs that look like they are compatible with the tt02 high speed gear adapter.  Can anyone recommend a compatible spur in the US? I've heard 3racing and rw racing make compatible ones,  but can't seem to find which model exactly. Trial and error ordering from the uk to texas just sounds too expensive.  So please,  if anyone has experience with running 64p or 48p gears in a tt02, please help me understand what I need to be doing.  Not sure if there just another drive line setup that might work better,  or if there's known brand and models that are compatible with the adapter.  

 

Thanks in advance.  I'm just trying to do speedrunning with a tt02 and I'm kind of at a point that I really need to start gearing up significantly.

Hello there. I went through the same thing. TheRCRacer has a wonderful blog on the subject, but he is in the UK. For us in the US, sourcing the spurs can be tricky. Which ones will be thick enough? Will the center bore fit the spur holder? Etc.

After wasting a bit of money on multiple spurs that didn't fit, here is my recommendation: go for the Kimbrough spurs available on AMain (I have only tried 64p).

https://www.amainhobbies.com/kimbrough-64p-precision-spur-gear-100t-kim207/p462757?v=32169

However, note that you will only be able to use 2 out of the 4 retaining screws unless you want to redrill the spur as the hole pattern is different than Tamiya. That is NOT a problem at all. The retaining screws are transferring the torque and 2 screws out of 4 is already massively overkill, i.e. you would need an order of magnitude more torque to shear these screws. So you can go ahead and use only 2 screws. If that really bothers you (some of us are a little OCD and that often applies to me :D), you can use a transfer punch and carefully punch a dot on the spur, through the 2 remaining holes in the spur holder (be careful as the holes are obviously threaded and the holder is aluminum). Then drill the spur to 3mm. A press drill is highly recommended to get clean and vertical holes. See? OCD lol. Again this step is completely optional.

I have successfully used the Kimbrough 100t and 104t, but I am not sure the 108t would fit (might be too big for the gear cover and/or gear housing).

Best of luck!

PS: this is a transfer punch set:

image.jpeg.832b083fed11838ab38f12597b5028d6.jpeg

That is a tool I find myself using all the time on RC cars although it was purchased decades ago for a totally different purpose.

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2 hours ago, Pylon80 said:

Hello there. I went through the same thing. TheRCRacer has a wonderful blog on the subject, but he is in the UK. For us in the US, sourcing the spurs can be tricky. Which ones will be thick enough? Will the center bore fit the spur holder? Etc.

After wasting a bit of money on multiple spurs that didn't fit, here is my recommendation: go for the Kimbrough spurs available on AMain (I have only tried 64p).

https://www.amainhobbies.com/kimbrough-64p-precision-spur-gear-100t-kim207/p462757?v=32169

However, note that you will only be able to use 2 out of the 4 retaining screws unless you want to redrill the spur as the hole pattern is different than Tamiya. That is NOT a problem at all. The retaining screws are transferring the torque and 2 screws out of 4 is already massively overkill, i.e. you would need an order of magnitude more torque to shear these screws. So you can go ahead and use only 2 screws. If that really bothers you (some of us are a little OCD and that often applies to me :D), you can use a transfer punch and carefully punch a dot on the spur, through the 2 remaining holes in the spur holder (be careful as the holes are obviously threaded and the holder is aluminum). Then drill the spur to 3mm. A press drill is highly recommended to get clean and vertical holes. See? OCD lol. Again this step is completely optional.

I have successfully used the Kimbrough 100t and 104t, but I am not sure the 108t would fit (might be too big for the gear cover and/or gear housing).

Best of luck!

PS: this is a transfer punch set:

image.jpeg.832b083fed11838ab38f12597b5028d6.jpeg

That is a tool I find myself using all the time on RC cars although it was purchased decades ago for a totally different purpose.

You are my hero! I've seen the Kimbrough ones and noticed they have a good low tooth count, and that misaligned hole pattern did lead me to think that 2 screws would work. But like you, ocd wants 4 screws. Punching and drilling makes perfect sense and I've got a drill press to drill,  just need to get smaller punches then. I'm going to give these a shot as amain ships quick to me.  I've spent way too much on testing these random spurs.. was so close when I ordered Schumacher one,  but they just weren't quite the right spacing on the holes.  

 

Really appreciate the feedback and definitely going to go this route

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18 minutes ago, alvinlwh said:

I had destroyed a spur holder by using the wrong spur before. Turns out there are a number of different variations in the mounting holes.

3R spurs are all the same as they are meant to be used on their own  cars which have the same spar holder holes. Now I also heard one of their spur older is compatible with Tamiya (FF-03 I think), which leads me to the conclusion their spur and holder have the same hole positions as Tamiya ones. So basically, you can get any 3R spur and it will work with your speed gear spur holder.

 

An Arrowmax one is probably wrong for Tamiya.

Thanks for the feedback! Yeah I'm definitely going low tooth count spur to avoid having to shave or cut out the spur cover.  Arrowmax is one I've looked at but hadn't ordered.  Will give them another look. Seems in the US that outside of tamiya branded,  there's just limited compatibility for spur mounting,  which I totally get.. I mean I don't think they ever intended for people to really go too far outside of their ecosystem, since they're the low cost entry level sets. But kind of why I'm also on this path of how fast can I really make a car that wasn't meant to go more than about 20mph go :) I'll be happy if I start hitting 60mph, and am hoping to break into the 100mph plus club some day

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15 minutes ago, sgsmith said:

You are my hero! I've seen the Kimbrough ones and noticed they have a good low tooth count, and that misaligned hole pattern did lead me to think that 2 screws would work. But like you, ocd wants 4 screws. Punching and drilling makes perfect sense and I've got a drill press to drill,  just need to get smaller punches then. I'm going to give these a shot as amain ships quick to me.  I've spent way too much on testing these random spurs.. was so close when I ordered Schumacher one,  but they just weren't quite the right spacing on the holes.  

 

Really appreciate the feedback and definitely going to go this route

Glad I could help.

Watch out for low tooth count on spur and pinion as you can get to a point were the motor hits the center beam of the lower deck and you can no longer get a good mesh.

You can use some online gear calculators to make sure you are within the design limits for the spurs and pinions diameters:

https://evolventdesign.com/pages/blank-calc

The largest spur Tamiya envisioned is the 70t in 0.6mm module. The largest pinion with that spur is 25t, smallest is 16t. Then the smallest spur they use is the 64t, that meshes to the largest pinion of 29t, smallest 22t. By converting these 0.6mm module spurs/pinions to 1/64" ones you can check that your spur and pinion combo is within limits. You can use a contact angle of 45deg and check the OD Reference Diameter in the reference for the total/overall diameter. Trial and error gets expensive fast with spurs and pinions!

Hope this helps.

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49 minutes ago, Pylon80 said:

Glad I could help.

Watch out for low tooth count on spur and pinion as you can get to a point were the motor hits the center beam of the lower deck and you can no longer get a good mesh.

You can use some online gear calculators to make sure you are within the design limits for the spurs and pinions diameters:

https://evolventdesign.com/pages/blank-calc

The largest spur Tamiya envisioned is the 70t in 0.6mm module. The largest pinion with that spur is 25t, smallest is 16t. Then the smallest spur they use is the 64t, that meshes to the largest pinion of 29t, smallest 22t. By converting these 0.6mm module spurs/pinions to 1/64" ones you can check that your spur and pinion combo is within limits. You can use a contact angle of 45deg and check the OD Reference Diameter in the reference for the total/overall diameter. Trial and error gets expensive fast with spurs and pinions!

Hope this helps.

Thanks,  didn't think about the contact issue with going too small on the spur,  but definitely makes sense.  I actually am running the tb05 63t spur at the moment with a 24t .6 pinion,  but there are so few options in that size. Ideally I'm hoping I can land somewhere in the low 40s for a spur and high 30s for pinion,  just not ready to cut out the top of the cover to fit the bigger pinions yet.  Have been going through all of the stew-mac, kaizertest, and a few others I've found on YouTube that seem to give a lot,  but not exact specific details on the setups. If I can get to 60mph on 2s, I'll start being really happy :) other side I'm working through at the moment is figuring out what motor/esc I'm going to end up on. Immediately dumped the stock tamiya,  went 10bl120, with a 2850kv I had lying around.  So definitely need to up my kv, just don't want to spend Castla Mamba money hahaha. Thinking of stealing my max10 hobbywing 140amp out of my crawler and buying a 5400kv to use on it.  Only have a 3300kv motor to go with that one right now though.  

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3 hours ago, alvinlwh said:

Which ever one you get, carefully compare the hole positions against the original one. For me, the Arrowmax one "looks similar" to the original one and I just went ahead and fitted it. Turns out the holes are slightly off, and I ended up destroying the spur holder.

Thanks for the heads up on that.  I'm actually looking right now at some gear generator sites to get dimensions, pitch,  tooth count,  and then planning to look at getting some either printed in tough resin, or machined to spec.  I think I'm over trying to mix and match and will try to just run custom dimension gears

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16 hours ago, sgsmith said:

Thanks,  didn't think about the contact issue with going too small on the spur,  but definitely makes sense.  I actually am running the tb05 63t spur at the moment with a 24t .6 pinion,  but there are so few options in that size. Ideally I'm hoping I can land somewhere in the low 40s for a spur and high 30s for pinion,  just not ready to cut out the top of the cover to fit the bigger pinions yet.  Have been going through all of the stew-mac, kaizertest, and a few others I've found on YouTube that seem to give a lot,  but not exact specific details on the setups. If I can get to 60mph on 2s, I'll start being really happy :) other side I'm working through at the moment is figuring out what motor/esc I'm going to end up on. Immediately dumped the stock tamiya,  went 10bl120, with a 2850kv I had lying around.  So definitely need to up my kv, just don't want to spend Castla Mamba money hahaha. Thinking of stealing my max10 hobbywing 140amp out of my crawler and buying a 5400kv to use on it.  Only have a 3300kv motor to go with that one right now though.  

I'm on a similar journey - trying to get a TT-02 fast. I've only got to 45mph with 64T spur, 30T pinion, 4600kv Robitronic on 2S. Now play around with other cheap high kv motors on 2S without spending Castle money! Biggest problem now is going straight. The old set up would do 45mph straight as an arrow. I cant get my new set up to even drive straight.

Good luck.

KP

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2 hours ago, Keracticus Pots said:

I'm on a similar journey - trying to get a TT-02 fast. I've only got to 45mph with 64T spur, 30T pinion, 4600kv Robitronic on 2S. Now play around with other cheap high kv motors on 2S without spending Castle money! Biggest problem now is going straight. The old set up would do 45mph straight as an arrow. I cant get my new set up to even drive straight.

Good luck.

KP

You've got me beat on speed at the moment.  But I'm still on a 2850kv with 63/22. Motor and gears are my definite next step.  I'm hitting 26 max on 2s at the moment and 37 on 3s.

Yeah I'm worried about how hard it's going to be to get it as centered as possible. I've upgraded steering and knuckles,  adjusted toe in for the back wheels,  but I'm sure one it gets really going keeping it straight is going to be difficult.  I'm thinking gyro is going to help along with probably shimming steering to get rid of the play. I think high torque servo to hold it center may be a need at some point too.

 

I'm interested to compare notes and share what I know and have since if you're up for it. 

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On 6/13/2023 at 3:44 PM, sgsmith said:

You've got me beat on speed at the moment.  But I'm still on a 2850kv with 63/22. Motor and gears are my definite next step.  I'm hitting 26 max on 2s at the moment and 37 on 3s.

Yeah I'm worried about how hard it's going to be to get it as centered as possible. I've upgraded steering and knuckles,  adjusted toe in for the back wheels,  but I'm sure one it gets really going keeping it straight is going to be difficult.  I'm thinking gyro is going to help along with probably shimming steering to get rid of the play. I think high torque servo to hold it center may be a need at some point too.

 

I'm interested to compare notes and share what I know and have since if you're up for it. 

I started a build thread but I've been pretty rubbish at keeping it up to date. I'll have to update it with where I've got to - I've tried a gyro and multiple servos.

KP

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15 hours ago, Keracticus Pots said:

I started a build thread but I've been pretty rubbish at keeping it up to date. I'll have to update it with where I've got to - I've tried a gyro and multiple servos.

KP

I got to 50 with a 3s, 3600kv,75:31 spur to pinion the other day. Am looking to find an alternate spur hub that could be modified to fit, so I can try mounting other brands. Been tearing up spur gears recently and had massive slop in the drive shaft. Took me a week to realize that at one point when I was changing bearings, I mistakenly put 10mm instead of 11's on the prop shaft cups. The 50mph was on the too small bearings. Thankfully the rings and pinions on both ends didn't get damaged,  just wasted 15 bucks or so on spurs that were getting worn at an angle. Lesson learned for me to double check my measurements when swapping parts. Put in new proper sized bearings and it's running as smooth as can be now. 

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I have a Xenon Racing 66T 48p spur on mine, it fits perfectly. Biggest pinion I’ve used on it it is 39T and it required trimming the spur cover

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