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A bicycle hydraulic hose cap comprises a hose attachment to be detachably attached to an end of a hydraulic hose, and a reservoir including a fluid chamber having a variable internal volume. The fluid chamber is connected to a fluid passageway of the hydraulic hose in an attachment state where the h

A bicycle hydraulic hose cap comprises a hose attachment to be detachably attached to an end of a hydraulic hose, and a reservoir including a fluid chamber having a variable internal volume. The fluid chamber is connected to a fluid passageway of the hydraulic hose in an attachment state where the hose attachment is attached to the end of the hydraulic hose.

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1. A bicycle hydraulic hose cap comprising: a hose attachment to be detachably attached to an end of a hydraulic hose; anda reservoir including a fluid chamber having a variable internal volume, the fluid chamber being connected to a fluid passageway of the hydraulic hose in an attachment state wher

1. A bicycle hydraulic hose cap comprising: a hose attachment to be detachably attached to an end of a hydraulic hose; anda reservoir including a fluid chamber having a variable internal volume, the fluid chamber being connected to a fluid passageway of the hydraulic hose in an attachment state where the hose attachment is attached to the end of the hydraulic hose, the reservoir including a deformable portion which is elastically deformable, whereinthe hose attachment includes an attachment hole in which the end of the hydraulic hose is inserted and a communication hole connecting the attachment hole to the fluid chamber, the communication hole having a diameter that is smaller than a diameter of the attachment hole. 2. The bicycle hydraulic hose cap according to claim 1, wherein the deformable portion is elastically deformable so as to vary the variable internal volume. 3. The bicycle hydraulic hose cap according to claim 2, wherein the reservoir includes a tubular part extending from the hose attachment, andthe tubular part includes the deformable portion. 4. The bicycle hydraulic hose cap according to claim 2, wherein a maximum thickness of the deformable portion is smaller than a maximum thickness of the hose attachment in a radial direction defined relative to a center axis of the end of the hydraulic hose. 5. The bicycle hydraulic hose cap according to claim 1, wherein an inner diameter of the communication hole is in a range from 0.1 mm to 3 mm. 6. The bicycle hydraulic hose cap according to claim 1, wherein the attachment hole has a first axial length in an axial direction,the fluid chamber has a second axial length in the axial direction, andthe second axial length is larger than the first axial length. 7. The bicycle hydraulic hose cap according to claim 6, wherein a rate of the second axial length to the first axial length is in a range from 110% to 400%. 8. The bicycle hydraulic hose cap according to claim 1, wherein the attachment hole includes a first center axis,the diameter of the attachment hole is a first diameter relative to the first center axis,the fluid chamber has a second diameter relative to the first center axis, andthe second diameter is larger than the first diameter. 9. The bicycle hydraulic hose cap according to claim 8, wherein a rate of the second diameter to the first diameter is in a range from 105% to 200%. 10. The bicycle hydraulic hose cap according to claim 1, wherein the reservoir is integrally provided with the hose attachment as a one-piece unitary member. 11. The bicycle hydraulic hose cap according to claim 1, wherein the reservoir includes a reservoir body including a cylinder connected to the fluid passageway of the hydraulic hose in the attachment state where the hose attachment is attached to the end of the hydraulic hose, anda piston movably provided in the cylinder, andthe fluid chamber is defined by the reservoir body and the piston in the cylinder. 12. The bicycle hydraulic hose cap according to claim 11, wherein the reservoir body is integrally provided with the hose attachment as a one-piece unitary member. 13. The bicycle hydraulic hose cap according to claim 1, wherein the reservoir includes a balloon, andthe fluid chamber is provided in the balloon. 14. The bicycle hydraulic hose cap according to claim 13, wherein the balloon is integrally provided with the hose attachment as a one-piece unitary member. 15. The bicycle hydraulic hose cap according to claim 1, further comprising: an additional hose attachment to be detachably attached to an end of an additional hydraulic hose. 16. A bicycle hydraulic hose assembly comprising: a hydraulic hose including a fluid passageway; anda bicycle hydraulic hose cap comprising: a hose attachment to be detachably attached to an end of the hydraulic hose; anda reservoir including a fluid chamber having a variable internal volume, the fluid chamber being connected to the fluid passageway of the hydraulic hose in an attachment state where the hose attachment is attached to the end of the hydraulic hose, whereinthe hose attachment includes an attachment hole in which the end of the hydraulic hose is inserted and a communication hole connecting the attachment hole to the fluid chamber, the communication hole having a diameter that is smaller than a diameter of the attachment hole. 17. The bicycle hydraulic hose assembly comprising: a hydraulic hose including a fluid passageway; anda bicycle hydraulic hose cap comprising: a hose attachment to be detachably attached to an end of the hydraulic hose; anda reservoir including a fluid chamber having a variable internal volume, the fluid chamber being connected to the fluid passageway of the hydraulic hose in an attachment state where the hose attachment is attached to the end of the hydraulic hose, whereinthe hose attachment includes an attachment hole in which the end of the hydraulic hose is inserted,the hydraulic hose includes a hose body defining the fluid passageway, anda film attached to an end of the hose body, the film including a through-hole. 18. The bicycle hydraulic hose cap according to claim 17, wherein an inner diameter of the through-hole is in a range from 0.1 mm to 3 mm. 19. The bicycle hydraulic hose cap according to claim 1, wherein the deformable portion includes an outer circumferential periphery of the reservoir. 20. The bicycle hydraulic hose cap according to claim 1, wherein the hose attachment includes a sidewall disposed about an outer periphery of the communication hole so as to abut a distal end of the hydraulic hose in an axial direction of the hydraulic hose in the attachment state when the hose attachment is attached to the end of the hydraulic hose. 21. The bicycle hydraulic hose assembly according to claim 16, wherein the deformable portion includes an outer circumferential periphery of the reservoir. 22. The bicycle hydraulic hose assembly according to claim 16, wherein the hose attachment includes a sidewall disposed about an outer periphery of the communication hole so as to abut a distal end of the hydraulic hose in an axial direction of the hydraulic hose.