<p>There are <a href="http://alpha.bricklink.com/pages/clone/searchproduct.page?q=string#T=A" rel="nofollow">many kinds of LEGO string</a>, which are compatible with pulleys, but they are not closed in a loop, but manufactured as a single thread. You could tie a knot on them to form a loop, but the string lacks the traction of a rubber band, so you should definitely consider this if you plan to transmit power via a belt drive made of a string.</p>

CC BY-SA 3.0
2015-10-18T13:52:34.563Z
2015-10-18T13:52:34.563Z
zovits
<p>Many office supply/stationary stores will sell rubber bands large enough to do a similar job.</p>

<p>I've managed to find a large rubber band 200mm long and 12.5mm in width. It would be too wide to fit on a standard TECHNIC pulley, but you can attach it to any TECHNIC wheel rim wide enough such as <a href="http://alpha.bricklink.com/pages/clone/catalogitem.page?P=56145&amp;idColor=11#T=C&amp;C=11" rel="nofollow">56145</a>. The grooves on either side of the wheel rim should keep the band from slipping.</p>

<p>I don't know exactly what you plan to build, but you might want to also consider other ways of ways of transmitting power, could you perform the same function as efficiently using a <a href="https://en.wikipedia.org/wiki/Drive_shaft" rel="nofollow">drive shaft</a>.</p>

CC BY-SA 3.0
2015-10-20T17:12:08.710Z
WRO only allows LEGO PRODUCTS... :(
undo
CC BY-SA 3.0
2015-10-18T17:49:59.080Z
2015-10-18T17:57:40.890Z
2015-10-18T17:57:40.890Z
Ambo100
<p>Have LEGO threads ever been produced? Even the biggest LEGO rubber band is too short to meet my requirements. </p>

<p>I need them for this year's WRO challenge. Note that the challenge only allows Lego products, so I can't just buy the rubber band I need elsewhere.</p>

CC BY-SA 3.0
2015-10-18T17:23:50.357Z
Roughly how big of a rubber band do you need?
Ambo100
CC BY-SA 3.0
2015-11-26T03:42:59.483Z
Do you need rubber bands, string, or both? If you need long rubber bands you may have to either loop them together and use wheels instead of pulleys, or use Lego [chain links or tread links](https://www.bricklink.com/catalogList.asp?catType=P&catString=138) to make arbitrarily long loops
Móż
<technic>
Where can I get threads compatible with LEGO pulleys?
undo
# Where can I get threads compatible with LEGO pulleys?

(Asked by: username_0 on 2015-10-18)

Have LEGO threads ever been produced? Even the biggest LEGO rubber band is too short to meet my requirements.

I need them for this year's WRO challenge. Note that the challenge only allows Lego products, so I can't just buy the rubber band I need elsewhere.

**Tags:** technic

> **Comments:**
> **username_1**: Roughly how big of a rubber band do you need?  
> **username_2**: Do you need rubber bands, string, or both? If you need long rubber bands you may have to either loop them together and use wheels instead of pulleys, or use Lego [chain links or tread links](https://www.bricklink.com/catalogList.asp?catType=P&catString=138) to make arbitrarily long loops  

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## 2 answers

### Answer by username_3 on 2015-10-18. Score: 3

There are [many kinds of LEGO string](http://alpha.bricklink.com/pages/clone/searchproduct.page?q=string#T=A), which are compatible with pulleys, but they are not closed in a loop, but manufactured as a single thread. You could tie a knot on them to form a loop, but the string lacks the traction of a rubber band, so you should definitely consider this if you plan to transmit power via a belt drive made of a string.


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### Answer by username_1 on 2015-10-18. Score: 3

Many office supply/stationary stores will sell rubber bands large enough to do a similar job.

I've managed to find a large rubber band 200mm long and 12.5mm in width. It would be too wide to fit on a standard TECHNIC pulley, but you can attach it to any TECHNIC wheel rim wide enough such as [56145](http://alpha.bricklink.com/pages/clone/catalogitem.page?P=56145&idColor=11#T=C&C=11). The grooves on either side of the wheel rim should keep the band from slipping.

I don't know exactly what you plan to build, but you might want to also consider other ways of ways of transmitting power, could you perform the same function as efficiently using a [drive shaft](https://en.wikipedia.org/wiki/Drive_shaft).

> **Comments:**
> **username_0**: WRO only allows LEGO PRODUCTS... :(  

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