Parts › VILLIERS 32A,37A TRIALS 16 TEETH ENGINE SPROCKET 9437/16 Image 1 of 3 Image 2 of 3 Image 3 of 3 VILLIERS 32A,37A TRIALS 16 TEETH ENGINE SPROCKET 9437/16 £25.00 16 Tooth primary sprocket to replace the original 20 tooth sprocket. Brings Gearing down for trials use Quantity: Add To Cart Added! 16 Tooth primary sprocket to replace the original 20 tooth sprocket. Brings Gearing down for trials use