Hi Colin,
my front discs need change soon too, here is my search so far:
First the part codes, in fact many front brake discs for different brands like Cagiva, Ducati and Moto Guzzi
will fit our Yamaha according to Ferodo part catalog Ferodo part number is FMD0121:
[table][tr] [td][/td][td]COMPETITOR XREF[/td][/tr] [tr] [td]
Here is the cheapest pair for 2 Ferodo quality discs I have found so far £240:
http://www.ebay.co.uk/itm/Yamaha-TDM850-...3f14c6c806
Here are some EBC quality ones 205 EUR about £144 for one disc so the pair would be about £290 does not make much sense to me compared to Ferodo which IMO are one of the best:
http://www.motorparts.nl/index.php?main_...anguage=en
and here from EBC UK:
http://ebcbrakesdirect.com/store/Motorcy...d237a7b1ae
Here are some good Chinese ones from ARASHI moto I have not decided but may try ones about £130 for 2 discs pair:
http://www.madhornets.com/front-brake-di...tAodSn8ApA
[/td][/tr][/table]
Here is a review from a guy running Arashi discs and still alive: :lol
www.bikersoracle.com/cbr600/forum/showthread.php?s=16a1794cfadc98a540c69a9b8f79a23c&t=24084&page=1
my front discs need change soon too, here is my search so far:
First the part codes, in fact many front brake discs for different brands like Cagiva, Ducati and Moto Guzzi

[table][tr] [td][/td][td]COMPETITOR XREF[/td][/tr] [tr] [td]
BRAKING
[/td] [td]STX15
[/td][/tr] [tr] [td]EBC
[/td] [td]MD2001LS/RS
[/td][/tr] [tr] [td]NEWFREN
[/td] [td].DF.5167 AF
[/td][/tr] [tr][td] EQUIVALENT OE #[/t] [table][tr] [td]OEM
[/td] [td]3EN 2581T 00
[/td][/tr] [tr] [td]OEM
[/td] [td]3CV 25830 10
[/td][/tr] [tr] [td]OEM
[/td] [td]4HM 2581T 11
[/td][/tr] [tr] [td]OEM
[/td] [td]3 HE 2581T 00
[/td][/tr] [tr] [td]OEM
[/td] [td]3RG 2581T 00
[/td][/tr] [tr] [td]OEM
[/td] [td]3CW 2581T 00
[/td][/tr] [tr] [td]OEM
[/td] [td]3CV 25830 00
[/td][/tr] [tr] [td]OEM
[/td] [td]4HM 2581T 00
[/td][/tr] [tr] [td]OEM Moto Guzzi
[/td] [td]306133000
[/td][/tr] [tr] [td]OEM Yamaha
[/td] [td]4HM 2582T 21
[/td][/tr] [tr] [td]OEM Yamaha
[/td] [td]3CW 2582T 00
[/td][/tr][/table] http://ecat.ferodoracing.com/motorcycle/...cs/FMD0121Here is the cheapest pair for 2 Ferodo quality discs I have found so far £240:
http://www.ebay.co.uk/itm/Yamaha-TDM850-...3f14c6c806
Here are some EBC quality ones 205 EUR about £144 for one disc so the pair would be about £290 does not make much sense to me compared to Ferodo which IMO are one of the best:
http://www.motorparts.nl/index.php?main_...anguage=en
and here from EBC UK:
http://ebcbrakesdirect.com/store/Motorcy...d237a7b1ae
Here are some good Chinese ones from ARASHI moto I have not decided but may try ones about £130 for 2 discs pair:
http://www.madhornets.com/front-brake-di...tAodSn8ApA
[/td][/tr][/table]
Here is a review from a guy running Arashi discs and still alive: :lol
www.bikersoracle.com/cbr600/forum/showthread.php?s=16a1794cfadc98a540c69a9b8f79a23c&t=24084&page=1