Changing Product Image Sizes In Magento 1

Resize images to fit your designs

Per standard, the Clerk.io extension for Magento fetches images with a size of 210x210 px. 

This can be changed in the following file:
app->code->community->Clerk->Clerk->Catalog->Product.php

In the top of this file, the $imageHeight  and $imageWidth  variables control the height and width of each image:

Change these values to the size you want images to have, and save the file.
Then go to my.clerk.io -> Data Sync and run a new sync, by clicking Start Sync.

Your new images will now be synced.