Answers.Body: <p>Just like the other answer by @matthew jensen, I do not have the roller coaster wheels in my possession, so my answer is entirely based on what seems to work in Stud.io.</p>
  <p>It looks like you can construct a basic wheelholder using <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=3176&amp;name=Plate,%20Modified%202%20x%203%20with%20Hole&amp;category=%5BPlate,%20Modified%5D#T=C" rel="noreferrer">part 3176 - Plate 2x3 with Hole</a>. Here is how I would do this:</p>
  <p><a href="https://i.sstatic.net/uw7El.png" rel="noreferrer"><img src="https://i.sstatic.net/uw7El.png" alt="enter image description here" /></a></p>
  <p>I am using 2 small 1x2 - 1x2 inverted brackets and a 2x3 plate in the above.</p>
  <p>Here is how you would use the same (replacing the 2x3 plate with a 3x3 plate) to create a small minecart that (hopefully) rolls along the track. If a 5 stud wheelbase is too long to make it through LEGO rollercoaster track curves, you can shorten the build by 1 or 2 studs.</p>
  <p><a href="https://i.sstatic.net/tWtTK.png" rel="noreferrer"><img src="https://i.sstatic.net/tWtTK.png" alt="enter image description here" /></a></p>
  <p><a href="https://i.sstatic.net/olmQf.png" rel="noreferrer"><img src="https://i.sstatic.net/olmQf.png" alt="enter image description here" /></a></p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-09-18T06:40:44.027Z
Answers.Text: I've checked this assembly in LDCad. Roller coaster wheels indeed fit into the space. Based on the results I can see in LDCad small pins protruding from each side may be a little too short and barely have any plastic to hold on to plates. I'm not even sure if wheels would stay in place in case of a tiny bump or misalignment. However, it feels like this could work if which ever assembly will be put on top of these wheels will be static.
Answers.UserDisplayName: Alex
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-09-18T10:24:59.323Z
Answers.Text: I've been fiddling a bit with LeoCAD about using other pieces for this technique. It seems that the outer rim of the wheel has the right dimensions to accept a round 1x1 brick (on *either* end), so trying to use any piece to fit tighter might actually provide a solid connection (instead of allowing the wheel to spin).
Answers.UserDisplayName: IvanSanchez
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-09-17T20:23:23.303Z
Answers.LastActivityDate: 2021-09-17T20:23:23.303Z
Answers.UserDisplayName: Phil B.
Answers.Body: <p>Disclaimer: I don't have the roller coaster wheels or body, and have not tried this.</p>
  <p>The <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=45917c01&amp;name=Minifigure,%20Utensil%20Skateboard%20with%20Mag%20Wheel%20Holders%20and%20White%20Mag%20Wheels&amp;category=%5BMinifigure,%20Utensil%5D#T=C" rel="noreferrer">Skateboard with mag wheels</a> comes to mind, as an example of a bar connection with little friction.<br />
  <a href="https://img.bricklink.com/ItemImage/PN/5/45917c01.png" rel="noreferrer"><img src="https://img.bricklink.com/ItemImage/PN/5/45917c01.png" alt="enter image description here" /></a></p>
  <p>If I remember correctly, the wheel bars are of normal diameter (regular clips have normal friction), so it is the board clips which are slightly larger than a regular clip.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-09-17T04:41:57.733Z
Answers.Text: This is a good approach, but not without drawbacks. The rollercoaster wheels might slide sideways and hit the sides of the top part of the skateboard. It also forces a fixed axle distance that might cause trouble with narrow curves.
Answers.UserDisplayName: IvanSanchez
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-09-17T04:22:31.173Z
Answers.LastActivityDate: 2021-09-17T04:22:31.173Z
Answers.UserDisplayName: Matthew Jensen
Answers.Body: <p>The diameter of a bar (i.e. the axle) is the same as the distance between two studs. This can be leveraged in a variety of ways using hollow studs and bars.</p>
  <p>This uses upside-down <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=85861" rel="noreferrer">85861 1x1 round plate</a>s and short bar parts (<a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=48729" rel="noreferrer">48729</a>):</p>
  <p><a href="https://i.sstatic.net/yvb3Q.png" rel="noreferrer"><img src="https://i.sstatic.net/yvb3Q.png" alt="LeoCAD diagram" /></a>
  <a href="https://i.sstatic.net/IP8lt.png" rel="noreferrer"><img src="https://i.sstatic.net/IP8lt.png" alt="LeoCAD diagram" /></a></p>
  <p>The hollow studs can be moved up and down in order to adjust the friction.</p>
  <p>Same technique, using <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=3959" rel="noreferrer">3959 Minifig Utensil, Torch</a> and <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=11203" rel="noreferrer">11203 2x2 inverted tile</a>:</p>
  <p><a href="https://i.sstatic.net/teXOF.png" rel="noreferrer"><img src="https://i.sstatic.net/teXOF.png" alt="LeoCAD diagram" /></a>
  <a href="https://i.sstatic.net/LbyuQ.png" rel="noreferrer"><img src="https://i.sstatic.net/LbyuQ.png" alt="LeoCAD diagram" /></a></p>
  <p>The friction on the axle will depend on how deep the torch is pushed into the inverted tile.</p>
  <p>A few <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=2555" rel="noreferrer">2555 1x1 tile with clip</a> and an upside-down <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=4238" rel="noreferrer">4238 trunk lid</a> (from the silver mine set), and we've got ourselves a minecart:</p>
  <p><a href="https://i.sstatic.net/iOCE0.png" rel="noreferrer"><img src="https://i.sstatic.net/iOCE0.png" alt="LeoCAD diagram" /></a></p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-09-18T12:16:18.093Z
Answers.LastActivityDate: 2021-09-18T12:16:18.093Z
Answers.UserDisplayName: IvanSanchez
Body: <p>While doing a bit of research about a <a href="https://bricks.stackexchange.com/questions/16545/minimal-mine-track">mine track related question</a>, I noticed that part <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=24869" rel="noreferrer">24869 &quot;Wheel Roller Coaster&quot;</a> is meant to be used only with part 26021 to form a form <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=26021c01" rel="noreferrer">a specific assembly</a>:</p>
  <p><a href="https://i.sstatic.net/SGz29.png" rel="noreferrer"><img src="https://i.sstatic.net/SGz29.png" alt="Roller coaster car assembly" /></a></p>
  <p>I personally don't like the aesthetics of the car base, so I'm wondering about how to use the wheels without the car base. The axle has the same dimensions of a bar, so it can be used with clip plates or minifig hands:</p>
  <p><a href="https://i.sstatic.net/gS6hT.png" rel="noreferrer"><img src="https://i.sstatic.net/gS6hT.png" alt="Attaching wheels to clips" /></a></p>
  <p>...but that will obviously have a lot of friction.</p>
  <p>What building techniques and parts can be used to attach the roller coaster wheels (or, for that matter, any other bar part) to other parts <strong>with low enough friction</strong>?</p>
  <p>I'm looking for techniques for play (i.e. the vehicle should move along tracks and hold together when shaken), not for display (which can be achieved by high-friction clips).</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-09-17T13:01:38.817Z
Comments.Text: Without the rollercoaster parts to check, I reckon some of the smaller wheel assemblies might be compatible, but not [the one I was thinking of](https://www.bricklink.com/v2/catalog/catalogitem.page?P=2655c06&name=Plate,%20Round%202%20x%202%20Thin%20with%20Wheel%20Holder%20and%20Dark%20Purple%20Trolley%20Wheels%20(2655%20/%202496)&category=%5BPlate,%20Round%5D#T=C&C=86) as the bar has smaller sections where itc lips in
Comments.UserDisplayName: Chris H
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-09-18T07:22:09.347Z
Comments.Text: @Chris that part clips onto the narrower parts of the wheel piece, not the middle, where it is the usual bar diameter.
Comments.UserDisplayName: zovits
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-09-18T09:17:21.217Z
Comments.Text: @zovits, exactly. That's why I said not that one. I still think there's another but couldn't find anything
Comments.UserDisplayName: Chris H
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-09-18T10:05:48.647Z
Comments.Text: @ChrisH Right, sorry, I misread your comment and made the same point as you did.
Comments.UserDisplayName: zovits
Tags: <building><piece-usage><snot>
Title: Alternative ways of attaching roller coaster wheels
UserDisplayName: IvanSanchez
ThreadText: # Alternative ways of attaching roller coaster wheels
  
  (Asked by: username_0 on 2021-09-17)
  
  While doing a bit of research about a [mine track related question](https://bricks.stackexchange.com/questions/16545/minimal-mine-track), I noticed that part [24869 "Wheel Roller Coaster"](https://www.bricklink.com/v2/catalog/catalogitem.page?P=24869) is meant to be used only with part 26021 to form a form [a specific assembly](https://www.bricklink.com/v2/catalog/catalogitem.page?P=26021c01):
  
  [![Roller coaster car assembly](https://i.sstatic.net/SGz29.png)](https://i.sstatic.net/SGz29.png)
  
  I personally don't like the aesthetics of the car base, so I'm wondering about how to use the wheels without the car base. The axle has the same dimensions of a bar, so it can be used with clip plates or minifig hands:
  
  [![Attaching wheels to clips](https://i.sstatic.net/gS6hT.png)](https://i.sstatic.net/gS6hT.png)
  
  ...but that will obviously have a lot of friction.
  
  What building techniques and parts can be used to attach the roller coaster wheels (or, for that matter, any other bar part) to other parts **with low enough friction**?
  
  I'm looking for techniques for play (i.e. the vehicle should move along tracks and hold together when shaken), not for display (which can be achieved by high-friction clips).
  
  **Tags:** building, piece-usage, snot
  
  > **Comments:**
  > **username_1**: Without the rollercoaster parts to check, I reckon some of the smaller wheel assemblies might be compatible, but not [the one I was thinking of](https://www.bricklink.com/v2/catalog/catalogitem.page?P=2655c06&name=Plate,%20Round%202%20x%202%20Thin%20with%20Wheel%20Holder%20and%20Dark%20Purple%20Trolley%20Wheels%20(2655%20/%202496)&category=%5BPlate,%20Round%5D#T=C&C=86) as the bar has smaller sections where itc lips in  
  > **username_2**: @username_1 that part clips onto the narrower parts of the wheel piece, not the middle, where it is the usual bar diameter.  
  > **username_1**: @username_2, exactly. That's why I said not that one. I still think there's another but couldn't find anything  
  > **username_2**: @username_1 Right, sorry, I misread your comment and made the same point as you did.  
  
  ---
  
  ## 3 answers
  
  ### Answer by username_3 on 2021-09-17. Score: 5 | Accepted answer
  
  Just like the other answer by @username_5 username_5, I do not have the roller coaster wheels in my possession, so my answer is entirely based on what seems to work in Stud.io.
  
  It looks like you can construct a basic wheelholder using [part 3176 - Plate 2x3 with Hole](https://www.bricklink.com/v2/catalog/catalogitem.page?P=3176&name=Plate,%20Modified%202%20x%203%20with%20Hole&category=%5BPlate,%20Modified%5D#T=C). Here is how I would do this:
  
  [![enter image description here](https://i.sstatic.net/uw7El.png)](https://i.sstatic.net/uw7El.png)
  
  I am using 2 small 1x2 - 1x2 inverted brackets and a 2x3 plate in the above.
  
  Here is how you would use the same (replacing the 2x3 plate with a 3x3 plate) to create a small minecart that (hopefully) rolls along the track. If a 5 stud wheelbase is too long to make it through LEGO rollercoaster track curves, you can shorten the build by 1 or 2 studs.
  
  [![enter image description here](https://i.sstatic.net/tWtTK.png)](https://i.sstatic.net/tWtTK.png)
  
  [![enter image description here](https://i.sstatic.net/olmQf.png)](https://i.sstatic.net/olmQf.png)
  
  > **Comments:**
  > **username_4**: I've checked this assembly in LDCad. Roller coaster wheels indeed fit into the space. Based on the results I can see in LDCad small pins protruding from each side may be a little too short and barely have any plastic to hold on to plates. I'm not even sure if wheels would stay in place in case of a tiny bump or misalignment. However, it feels like this could work if which ever assembly will be put on top of these wheels will be static.  
  > **username_0**: I've been fiddling a bit with LeoCAD about using other pieces for this technique. It seems that the outer rim of the wheel has the right dimensions to accept a round 1x1 brick (on *either* end), so trying to use any piece to fit tighter might actually provide a solid connection (instead of allowing the wheel to spin).  
  
  ---
  
  ### Answer by username_5 on 2021-09-17. Score: 6
  
  Disclaimer: I don't have the roller coaster wheels or body, and have not tried this.
  
  The [Skateboard with mag wheels](https://www.bricklink.com/v2/catalog/catalogitem.page?P=45917c01&name=Minifigure,%20Utensil%20Skateboard%20with%20Mag%20Wheel%20Holders%20and%20White%20Mag%20Wheels&category=%5BMinifigure,%20Utensil%5D#T=C) comes to mind, as an example of a bar connection with little friction.  
  [![enter image description here](https://img.bricklink.com/ItemImage/PN/5/45917c01.png)](https://img.bricklink.com/ItemImage/PN/5/45917c01.png)
  
  If I remember correctly, the wheel bars are of normal diameter (regular clips have normal friction), so it is the board clips which are slightly larger than a regular clip.
  
  > **Comments:**
  > **username_0**: This is a good approach, but not without drawbacks. The rollercoaster wheels might slide sideways and hit the sides of the top part of the skateboard. It also forces a fixed axle distance that might cause trouble with narrow curves.  
  
  ---
  
  ### Answer by username_0 on 2021-09-18. Score: 5
  
  The diameter of a bar (i.e. the axle) is the same as the distance between two studs. This can be leveraged in a variety of ways using hollow studs and bars.
  
  This uses upside-down [85861 1x1 round plate](https://www.bricklink.com/v2/catalog/catalogitem.page?P=85861)s and short bar parts ([48729](https://www.bricklink.com/v2/catalog/catalogitem.page?P=48729)):
  
  [![LeoCAD diagram](https://i.sstatic.net/yvb3Q.png)](https://i.sstatic.net/yvb3Q.png)
  [![LeoCAD diagram](https://i.sstatic.net/IP8lt.png)](https://i.sstatic.net/IP8lt.png)
  
  The hollow studs can be moved up and down in order to adjust the friction.
  
  Same technique, using [3959 Minifig Utensil, Torch](https://www.bricklink.com/v2/catalog/catalogitem.page?P=3959) and [11203 2x2 inverted tile](https://www.bricklink.com/v2/catalog/catalogitem.page?P=11203):
  
  [![LeoCAD diagram](https://i.sstatic.net/teXOF.png)](https://i.sstatic.net/teXOF.png)
  [![LeoCAD diagram](https://i.sstatic.net/LbyuQ.png)](https://i.sstatic.net/LbyuQ.png)
  
  The friction on the axle will depend on how deep the torch is pushed into the inverted tile.
  
  A few [2555 1x1 tile with clip](https://www.bricklink.com/v2/catalog/catalogitem.page?P=2555) and an upside-down [4238 trunk lid](https://www.bricklink.com/v2/catalog/catalogitem.page?P=4238) (from the silver mine set), and we've got ourselves a minecart:
  
  [![LeoCAD diagram](https://i.sstatic.net/iOCE0.png)](https://i.sstatic.net/iOCE0.png)
  
  
  ---
  
  