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I have a Cannondale Tramount 3 e-bike that I would like to make better and lighter in every way I can for as little cost as possible, but with quality used or discounted parts.

Can someone help me with a tip for which fork to use (now it has a Suntour XCR, which is over 2.6kg) I think that with a 27.5 it will stand a litle more on its head but I think I still will have place for a 2.3 x 29 inch wheel. Originally it had 1.9, now it has lightweight 2.2 Maxxis tyres.

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    Welcome to Bicycles @KorErCannondalen. Nice to see you here, and good to see you've taken the tour. I recommend How to Ask to help you improve your question. Don't worry about your language skills; we can help. Edit your question to remove most of the discussion and chat that is not essential to the basic technical question you're asking, and try to focus on how you can solve the problem. Particular product recommendations are off topic here because they get out of date quickly. – andy256 Sep 3 '16 at 3:08
  • So thank for your understanding of difference in language skills.. – KorErCannondalen Sep 3 '16 at 16:19
  • But how would you edit this question of mine? – KorErCannondalen Sep 3 '16 at 16:20
  • And can you help the dialogue to start and give a answer to my question ..or should I ask it again ...after editing it and maybe direct the question on to : switching from Suntour to RS SID XX light weight and usefull..? – KorErCannondalen Sep 3 '16 at 16:24
  • Or is it so that people dont think one can place a 27.5 on a 29`r ..one can but I want to discuss the pros and cons on the subject and also the difference in maybe a Lauf spring fork wich have a suspension I havent tried yet, but can be a challenger (900grams) – KorErCannondalen Sep 3 '16 at 16:40
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The key to swapping forks is the axle to crown measurement - the distance from the center of the front axle to the seat of the crown race that is the lowest part of the headset. You want the replacement to be as close to the original as possible, to preserve the designed geometry. There are forks that can take either a 27.5 or a 29er wheel. The suspension fork is heavy, if your goal is light weight then you should consider the correct length carbon rigid fork. You will need to balance weight, cost...and what is available. Remember that you need to find a fork with the same steerer diameter - you can't put a tapered fork on a bike built to accept a standard 1 1/8" steerer. The difference between a 27.5 and a 29 can be large or small, depending on the tire size you choose - if you put a 27.5 wheel on the front with a 27.5 plus tire (3 inches wide) then the out diameter is nearly the same as a regular 29er tire, with a rigid fork you would have some suspension, too, without the weight. Good luck!

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