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Questions & Answers

Updated: 28/04/2021.

At the bottom of this page, in the comment section, you can ask what you wish to know. With a suggestion to first try a website search – your question may already have been answered:

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I answer as soon as I can, but depending on my other obligations, it might take over a week sometimes. For urgent questions, or private 1 on 1 consulting, see my consulting page.

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11 thoughts on “Questions & Answers”

  1. Hi Relja
    Can I use Campagnolo Centaur 10 speed, chain and derailleur, on an Elite Zumo smart trainer with a Shimano 10 speed cassette?
    Many Thanks in advance.
    Kenny

    Reply
    • Campagnolo 10 speed cassettes have different pitch, while their 10 speed chains have different width, compared to Shimano 10 speed ones.
      So I would not expect it to work very well, but haven’t tried it. Sometimes, close enough works satisfactory, sometimes not. In this case – I would expect shifting to be rather poor.

  2. I am looking for a Suspension seat post for a Raleigh witch is 36.1 But none of the post match that size

    Reply
    • While I like to think I’m a wizard – making 20+ year old bicycles and computers up and running – suspension stuff is out of my area of expertise. 🙂

      Hopefully, an expert on the topic will come across these comments and provide a shopping link.

      An alternative could be using a shim to fit a smaller diameter seatpost – if such can be sourced (both the seatpost, and a matching shim).
      Shim can also be machined. With a DIY option of cutting a can of beer, or some poisonous sugar filled “soft drink” (yack! 🙂 ), making shims out of that, to match the difference in diameters. Minding it doesn’t slip inside the seat tube (hard to take out later) – leave some “lips” protruding out and aside, to keep it in place. And minding not to cut oneself when making and fitting it.

  3. Hello. I have a few Sram max shift 3.0, 7 x 3 grip shifters that are new im trying to use up in my shop. I have in-fact through the years used these with some types of shimano rear derailleurs, but do not remember which shimano, i think tourney, mabye alivio. My question is for an atb which Derailleur from shimano, least expensive can i use for the rear with my last few new pairs of sram grip shift shifters? Sorry for any confusion. I have always been a shiman person, i just want to know how i can use sram with shimano without breaking the bank on a sram derailleur. Thanks much

    Reply
    • I’m not sure which standard that shifter is. As I’ve noted in the rear shifter compatibility article, 7 speed SRAM shifters were made in a Shimano compatible cable pull configuration, as well as using SRAM’s “1:1” cable pull.

      If the shifter is 1:1, it will only work with SRAM 1:1 rear derailleurs (and, based on my calculation, but I haven’t tested this – with Shimano 11 speed road bicycle rear derailleurs, and Tiagra 4700 10 speed road RD).
      If the shifter is a “Shimano compatible”, then it should work with Shimano rear derailleurs for 6 to 9 speed, as well as with non-Tiagra 4700 10 speed road RD-s (but not with 10+ speed MTB RD-s).

  4. Can you help? Thanks.

    I have a new Tiagra triple front rapid fire shifter and an existing Shimao ALTUS front changer mech e-fitting (ie via bottom bracket). I have wired everything up and I cannot change over three chain rings. To change over two rings works but not three. I have adjusted the limit screws and the tightness of the cable. I cannot get it to work. What am I doing wrong? I have seen that rapid fire shifters are normally compatible with most front changers. Thanks very much, Andrew

    Reply
    • Tiagra 4700 (newest, 10-speed) shifters pull a lot more cable than the other, pre Tiagra, and most MTB front shifters.
      So Tiagra shifter could be pulling a lot more cable per shift, than the front derailleur (Altus) needs. That could be causing the problem.
      While first click can be configured to properly move the FD to the mid. chainring, the 2nd click probably wants to pull the FD too far out – so FD stop prevents the movement, and shifter can’t reach it’s click point, to stay in gear.

      If it is adjusted so that the 2nd click (pulling cable) puts the FD right over the largest chainring, then I would expect the first shift-down to move the FD too much, so it doesn’t stop at the middle chainring.

      I would get a Tiagra FD to solve the problem. Or choose some other front shifter.

      See the article on front shifter compatibility (including the last chapter “Trim option”).

  5. i usually use either velox or zefal rim cloth adhesive rim tapes as these have never failed on me,the secret to using these rim tapes is get ones that go past the rim holes well,if you use the skinny 13mm ones they will slip past the rim holes,17mm ones are good for most road bikes.at the moment there seems to be a worldwide shortage of these rim tapes and just wondering if any readers have a home made solution.

    Reply

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