# 80t chainring on the SX

**URL:** <https://www.stridaforum.com/t/80t-chainring-on-the-sx/1225>\
**Category:** Tips and Techs\
**Created:** [September 3, 2017, 2:51pm UTC](https://www.stridaforum.com/t/80t-chainring-on-the-sx/1225 "2017-09-03T14:51:29Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![one\_half\_3544](https://www.stridaforum.com/user_avatar/www.stridaforum.com/one_half_3544/32/22_2.png) [@one\_half\_3544](https://www.stridaforum.com/u/one_half_3544)\
**Post date:** [September 4, 2017, 9:44am UTC](https://www.stridaforum.com/t/80t-chainring-on-the-sx/1225/3 "2017-09-04T09:44:22Z")

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Well, yes. My mtb is dahon Cadenza xl with 39t/18t chainring/rear cog. This, with 2" tyres gives 47.5 gear inches in the 4th gear (according to [sheldon’s calculator](http://www.sheldonbrown.com/gear-calc.html)). This gear gives me 20-22km/h with comfortable cadence. 25 km/h if I spin really fast =)

Strida SD with 18" wheels has 48 gear inches according to [this post](https://www.stridaforum.com/t/gear-ratios-information-about-different-models-of-strida/304/1). So it looks like what I need.

I would have preferred something closer to the original strida 5 gear (53 gear inches), but, while finding/ordering bespoke chainring (90t?) might be an overcomable problem, finding a source of custom-length belts would be much more troublesome…

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