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Is there any website or way to find which bike parts I need to buy?

For example, following picture of chainring and there is no information on it to search on the internet.

enter image description here enter image description here

I tried image but no luck. I tried searching by frame number and model but no luck.

I'm looking for a matching spider that will be attached to the motor.

Criggie
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Rahul Patil
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    You're actually holding 2 pieces there; a chainring (with the teeth) which is bolted to a spider (the bit in the middle with the arms). Which one are you looking to replace? The answer will depend on that. – DavidW Aug 12 '22 at 17:40
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    May I suggest adding the number of bots and the distance between them to the search query? – ojs Aug 12 '22 at 18:03
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    What ojs is suggesting is to measure the distance between the centre of either opposite pair of bolts (across the middle of the spider) to find the "BCD" (Bolt Circle Diameter) of the chainring. Then search for "4 bolt {distance} BCD chainring" assuming that it's a new chainring (and not a spider) that you need. The chainring itself actually looks in pretty good shape, though, which is why I was wondering if you're trying to replace the spider instead. – DavidW Aug 12 '22 at 18:27
  • @DavidW - I thought he was referring to roBOTS! – Daniel R Hicks Aug 12 '22 at 18:57
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    @DavidW I'm looking for a matching spider that will be attached to the motor. – Rahul Patil Aug 12 '22 at 19:04
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    That may then depend on the type/brand of the motor. For example you may need to search "Bafang 4 bolt spider" if it were a bafang motor. Frame number and model generally mean very little when it comes to bikes. You're better off searching the brand and model name that is usually written on the top tube of the bike. – Nate W Aug 12 '22 at 21:40
  • I'm guessing the inner spline has worn off which is why you want a replacement? And the steel shaft of the motor is fine? If you'd noticed this sooner it may have been saveable. Also, have you over-powered the motor? The extra torque may have exacerbated this, and you might prefer to choose a steel part over an aluminium part. – Criggie Aug 12 '22 at 23:21
  • Does this answer your question? Terminology index - a list of bike part names and cycling concepts – mattnz Aug 13 '22 at 06:57

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