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TLDR: Shimano K03S or Swisstop Disc 34.

The HD-R290 brakes spec sheet do not indicate the pad to use, but finding subsitutes to the F10BS is possible.

According to Tektro website, F10BS are meant for HD-R310/R510 calipers. The compatibility chart on Tektro's site also states that the equivalent of these pads are Shimano K02S (resin, predecessor of K03S) and K04S (metal).

Swisstop indicates that they sell a brake pad compatible with these calipers: the Disc 34 (different variants, RS depicted here).

Note that I found a page that makes an explicit link between HD290 and the pads that I mentioned: the Cowboy 3 user manual, where the following is written:

The brake pads used on Cowboy bikes are the TEKTRO F10BS/F10XS but compatible pads include:

• TEKTRO HD-R290 brake pads
• Shimano K03S resin brake

TLDR: Shimano K03S or Swisstop Disc 34.

The HD-R290 brakes spec sheet does not indicate the pad to use - except that it must be resin, but finding subsitutes to the F10BS is possible.

According to Tektro website, F10BS are meant for HD-R310/R510 calipers. The compatibility chart on Tektro's site also states that the equivalent of these pads are Shimano K02S (resin, predecessor of K03S) and K04S (metal, excluded as indicated by the spec sheet).

Swisstop also indicates that they sell a brake pad compatible with these calipers: the Disc 34 (different variants, RS depicted here).

Note that I found a page that makes an explicit link between HD290 and the pads that I mentioned: the Cowboy 3 user manual, where the following is written:

The brake pads used on Cowboy bikes are the TEKTRO F10BS/F10XS but compatible pads include:

• TEKTRO HD-R290 brake pads
• Shimano K03S resin brake

According to Tektro website, F10BS are meant for HD-R310/R510 calipers.

Swisstop indicates that they sell a brake pad compatible with these calipers: the Disc 34 (different variants, RS depicted here). This page also indicates other pads that their pads can substitute, the most notable one being the Shimano K03S (the other Shimano have cooling fans), that are used in a lot of Shimano ranges, such as Dura-Ace, 105, Tiagra, XT, SLX,... If the SwissTop Disc 34 (which is already a substitute) can substitute F10BS pads, it's then not unreasonable to assume that the K03S is a valid substitute too.

The link between HD-R290 and F10BS/K03S, is confirmed in the Cowboy 3 user manual, where the following is written:

The brake pads used on Cowboy bikes are the TEKTRO F10BS/F10XS but compatible pads include:

• TEKTRO HD-R290 brake pads
• Shimano K03S resin brake

TLDR: Shimano K03S or Swisstop Disc 34.

The HD-R290 brakes spec sheet do not indicate the pad to use, but finding subsitutes to the F10BS is possible.

According to Tektro website, F10BS are meant for HD-R310/R510 calipers. The compatibility chart on Tektro's site also states that the equivalent of these pads are Shimano K02S (resin, predecessor of K03S) and K04S (metal).

Swisstop indicates that they sell a brake pad compatible with these calipers: the Disc 34 (different variants, RS depicted here).

Note that I found a page that makes an explicit link between HD290 and the pads that I mentioned: the Cowboy 3 user manual, where the following is written:

The brake pads used on Cowboy bikes are the TEKTRO F10BS/F10XS but compatible pads include:

• TEKTRO HD-R290 brake pads
• Shimano K03S resin brake

According to Tektro website, F10BS are meant for HD-R310/R510 calipers.

Swisstop indicates that they sell a brake pad compatible with these calipers: the Disc 34 (different variants, RS depicted here). This page also indicates other pads that their pads can substitute, the most notable one being the Shimano K03S (the other Shimano have cooling fans), that are used in a lot of Shimano ranges, such as Dura-Ace, 105, Tiagra, XT, SLX,... If the SwissTop Disc 34 (which is already a substitute) can substitute F10BS pads, it's then not unreasonable to assume that the K03S is a valid substitute too.

The link between HD-R290 and F10BS/K03S, is confirmed in the Cowboy 3 user manual.

According to Tektro website, F10BS are meant for HD-R310/R510 calipers.

Swisstop indicates that they sell a brake pad compatible with these calipers: the Disc 34 (different variants, RS depicted here). This page also indicates other pads that their pads can substitute, the most notable one being the Shimano K03S (the other Shimano have cooling fans), that are used in a lot of Shimano ranges, such as Dura-Ace, 105, Tiagra, XT, SLX,... If the SwissTop Disc 34 (which is already a substitute) can substitute F10BS pads, it's then not unreasonable to assume that the K03S is a valid substitute too.

The link between HD-R290 and F10BS/K03S, is confirmed in the Cowboy 3 user manual, where the following is written:

The brake pads used on Cowboy bikes are the TEKTRO F10BS/F10XS but compatible pads include:

• TEKTRO HD-R290 brake pads
• Shimano K03S resin brake