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12-vaihteinen Shimano GRX Di2
SHIMANOn legendaarinen gravelosasarja täydentyy 2x12 Di2 -versiolla
12-vaihteinen Shimano GRX Di2
SHIMANOn legendaarinen gravelosasarja täydentyy 2x12 Di2 -versiolla
Seikkailullisuus ja uteliaisuus uusia ajoympäristöjä kohtaan — kilpailullisia elementtejä unohtamatta — kuuluvat oleellisena osana gravelpyöräilyn luonteeseen. Siksi gravelorientoitujen varusteiden on oltava mahdollisimman korkeatasoisia ja varmistettava tarkka, luotettava ja häiriötön suorituskyky kaikissa olosuhteissa.
Shimano ymmärtää nämä käyttäjäodotukset ja tietää, että pieninkin ongelma voi pilata hauskanpidon, aiheuttaa turhautumista ja johtaa epäonnistumiseen menestyksen sijaan. Tällä ymmärryksellä on suuri merkitys Shimanon laajentaessa GRX-komponenttiperhettään.
Tutustu uuteen ergonomisilla kaksitoimikahvoilla, ketjun hallintaa parantavalla Shimano Shadow RD+ -varustetulla takavaihtajalla ja tarkkatoimisella graveloptimoidulla etuvaihtajalla varustettuun 12-vaihteiseen Shimano GRX Di2 RX825 -osasarjaan.
Gravel- ja sähköpyöräkäyttöön optimoidut 2x12-ratasvaihtoehdot
Tässä tarkasteltava komponenttisarja edustaa vuonna 2023 lanseeratun 2x12 GRX RX820 -osasarjan sähkövaihdeversiota. RX820:n mekaanisen version tapaan ratasvaihtoehdot käsittävät 48/31T- (RX820) tai 46/30T-kampisarjan (RX610) ja 12-vaihteisen 11-36T- (HG710) tai 11-34T-kasettipakan.
RX825:n kanssa yhteensopivat ratasvaihtoehdot:
• Kampisarja RX820 - 48/31T
• Kasettipakka HG710 - 11-36T
• Kasettipakat R9200, R8100, R7100 - 11-34T
Kaikki nämä ratasyhdistelmät ovat yhteensopivia Shimanon uusien sisäleveydeltään 25 mm:n WH-RX880-hiilikuitukiekkojen kanssa. Päivitetyllä DIRECT ENGAGEMENT -vapaanapalla varustetut RX880-kiekot muodostavat luotettavan yhteyden ajajan ja tien välille kaikissa ajoympäristöissä.
Kaikki neljä edellä lueteltua ratasvaihtoehtoa ovat nyt saatavilla Shimanon Di2-sähkövaihdejärjestelmään. RX825:n mahdollistama laaja välityssuhdealue ja tiiviit vaihdevälit varmistavat sopivan poljinnopeuden kaikenlaisissa ajotilanteissa.
Uusi GRX Di2 on 12-vaihteisten sisarmalliensa — Dura-Ace, Ultegra ja 105 Di2— tapaan langallinen, missä se on järkevää. Virtalähteenä sekä etu- että takavaihtajalle toimii keskusakku. Pienihalkaisijaiset johdot on kytketty suoraan akusta vaihtajiin, mikä eliminoi johtoliitinten tarpeen ja virtaviivaistaa kokoonpanoa. Integroitu, hyvin suojattu akku yksinkertaistaa myös latausprosessia.
RX825-takavaihtajassa on, kuten edellä mainittiin, Shimanon uraauurtava, on/off-kytkimellä varustettu SHADOW RD+ -mekanismi, joka vaimentaa käyttöääniä, helpottaa takapyörän irrottamista ja varmistaa tarkkatoimisen vaihteensiirron pitämällä ketjun sopivan kireällä ajon aikana.
Ensimmäisen sukupolven GRX-osasarjojen tapaan RX820- ja RX610-järjestelmät on varustettu +2,5 mm ulkonevalla ketjulinjalla, minkä ansiosta renkaalle jää enemmän tilaa ja pyörän säädöt on helpompi saada kohdalleen.
Langaton gravelohjaamo
12-vaihteiseen GRX Di2 -kokoonpanoon kuuluu langaton graveloptimoitu ohjaamo, jossa kohokuviopinnalla ja liukumattomilla jarrukahvoilla varustetut korotetut huput lisäävät turvallisuutta varmistamalla tukevan otteen. Turvallisuutta lisää edelleen myös jo 1. sukupolven GRX RX815 Di2 -vaihdevipuihin integroitu hupun sisäsivulla sijaitseva kolmas Di2-painike, joka lisää Di2-järjestelmäpainikkeiden määritysvaihtoehtoja.
Uusi Di2-järjestelmä mahdollistaa vaihtajien ohjauksen myös lisävaihdepainikkeiden avulla. Kun Shimano-satelliittikytkin yhdistetään joko huppuihin, tai droppi- tai aerotankoon, tarve ajonaikaiselle käsien asennon vaihtamiselle vähenee. Satelliittikytkimille voidaan GRX Di2 -kaksitoimikahvojen kolmannen painikkeen tapaan määrittää erilaisia toimintoja, esimerkiksi vaihteenvaihto, valojen ohjaus tai GPS-laitteiden tai kierrospainikkeen käyttö.
Uusien kaksitoimikahvojen graveloptimoitu design mahdollistaa saumattoman integroinnin flare-ohjaustankoihin. Käsien siirto ohjaustangosta hupuille tapahtuu sujuvammin ja pyöreämmän designin ansiosta huppujen pinta-ala on suurempi, mikä auttaa keventämään käsiin kohdistuvaa painetta. Parantunut ergonomia puolestaan mahdollistaa pidempikestoisen yhtäjaksoisen ajorupeaman.
E-TUBE PROJECT - Mukautusmahdollisuudet
E-TUBE PROJECT Cyclist -sovellus mahdollistaa vaihtonopeuden valinnan, painikemääritysten mukautuksen (mikä painike ohjaa mitäkin toimintoa), erilaisten vaihtotilojen ohjelmoinnin, (synkronoitu, puolisynkronoitu), vaihteensiirron tarkkuussäädön ja yhteydenmuodostuksen muiden valmistajien pyörätietokoneisiin.
FRONT SHIFT NEXT -toiminto on lanseerattu samanaikaisesti RX825-osasarjan kanssa. Mikä tahansa RX825 Di2:n kytkimistä voidaan käyttäjäystävällisen E-TUBE PROJECT Cyclist -sovelluksen avulla ohjelmoida käyttämään etuvaihtajaa. FRONT SHIFT NEXT -toiminto voidaan määrittää mille tahansa RX825-kaksitoimikahvan kolmesta painikkeesta. Tuloksena on yksinkertainen, intuitiivinen vaihteenvaihto, mitä arvostavat kaikki pyöräilijät taitotasosta riippumatta.
Vaihteenvaihtoprosessin yksinkertaistamisen lisäksi voidaan FRONT SHIFT NEXT -toiminnon avulla vapauttaa myös muita painikkeita esimerkiksi näytön selausta tai valojen päälle- ja poiskytkemistä tai "lap"-painikkeen käyttöä varten, mikä mahdollistaa käsien pitämisen tukevasti ohjaustangossa kaikissa ajotilanteissa.
Nämä harkitut mukautusvaihtoehdot yhdistettynä Shimanon legendaarisen tarkkaan ja luotettavaan sähkövaihdejärjestelmään tekevät laajennetusta GRX-komponenttiperheestä erinomaisen vaihtoehdon kaikille gravelpyöräilijöille.
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