This is original Bafang RM G310.250.DC/RM G320.250.R G311 Clutch Steel Gear bearing ring spare part. Spec: Teeth:54 Height:10mm Internal gear distance:65mm Tips you want to know. About shipping,we do standard Fedex/TNT/UPS fast shipping.Handling about 5 days and ETA 7-9 days ship.For this item we do AliExpress standard shipping, delivery would be 25-30day,please leave a note if you need a 7-15days fast delivery thanks. Warranty,we do 1 year warranty for this product. This product is limited usage of Bafang RM G310.250.DC,they may not fit to other motor models and which is not our duty.Please note before purchase.

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